Vitamins for Hair Growth: Hair Growth Supplements That Work

Your hair is built by some of the busiest cells in your body. The matrix cells at the root of each follicle divide faster than almost any others, so they need a steady supply of iron, protein, zinc and vitamins every day.21 When stored iron, vitamin D, thyroid hormone or stress hormones run short or run high, your hair is one of the places it shows.

If your hair is thinning, the way forward is to find the root cause, refill what's missing with food first, and give your follicles about three months to answer.6 I've worked with thousands of patients on helping them naturally thicken their hair,8 and below you'll find what to look for, what to test, what to eat, and which vitamins and hair growth supplements have the research behind them.

Dr. Josh Axe Vitamin Advisor · 4–5 questions

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Did you know?

• About 50% of men have pattern hair loss by age 50, and nearly 50% of women are affected too.9

• More than 60 years ago, a study by a researcher named Hård found that iron supplements helped women with hair loss who were low in iron but not anemic.10

• Diffuse hair loss is sometimes the first sign of an underactive thyroid.11

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What your hair is telling you: the root causes of thinning hair

On my show, I've named three big causes of thinning hair: too much of the hormone DHT, a lack of nutrients such as B vitamins, zinc and collagen, and emotional stress that pushes cortisol too high.8 Two more belong on that list, starting with a slow thyroid, which thins hair and gets its own section below.611 The other is absorption, because what you absorb matters as much as what you eat: poor digestion and fermentation reduce how much protein you absorb, and thinning hair is one of the signs that you're not absorbing enough.12

Inflammation ties several of these together, and as I've explained, eating too many carbohydrates, sugars and grains causes inflammation that raises DHT and, over time, thins your hair.13

For women, stored iron is the first nutrient to check. In case-control studies of 60 women in Iran and 120 in Egypt, women with shedding or pattern thinning had lower ferritin, the measure of stored iron, than women without hair loss, and the Egyptian study found lower vitamin D too.314 Iron deficiency can reach your hair while a basic anemia test still reads normal.15 Crash diets and low-protein eating can set off shedding as well, and the Thyroid Reset in my Hypothyroidism Protocol puts both on its avoid list.16

Traditional Chinese medicine reads thinning hair as one sign of blood deficiency, a pattern in which, as I've explained it, your blood isn't nourished enough and doesn't carry enough iron, oxygen and nutrients to the rest of your body. Pale lips and nails, poor sleep, dizziness when you stand up and a pale tongue fill out the picture.15 The traditional answer is to build the blood, and to do that, I recommend some iron, often every other day, and the herb dong quai, a traditional Chinese blood tonic, along with beets, lean red meat, steamed leafy greens and warming foods such as soups.1516 Red meat and leafy greens bring the iron, and ferritin is the test that shows whether your stores are filling.

Two of my five traditional prescriptions for hair loss are Chinese herbs as well: fo-ti, historically known for stopping hair loss, at 1,000 to 2,000 mg a day, and Panax ginseng, to stimulate the follicles, at 500 mg twice a day. Rehmannia, another Chinese herb, is among the other remedies I list.17

How hair growth works in your body

Each hair grows from a follicle that cycles through growing, resting and shedding, and the growing phase is when the root needs its raw materials most.1

Your hair depends on your nutrient stores, your thyroid and your stress hormones, so that's where thicker hair starts.

The tests to ask for first

Ask your doctor or practitioner for these four, and read them against optimal ranges, which are narrower than standard lab ranges.7 Taking biotin? Pause it before your draw (the safety section gives the timing).

Testing matters because the gaps differ from person to person. In a 2024 Turkish case-control study of 90 women with chronic shedding and 90 without, zinc ran lower in the women who were shedding, while ferritin, B12, vitamin D and thyroid tests came out similar, and the researchers called for testing each woman for what her history suggests and building her treatment around the results.20

Food first: the best foods for hair growth

My Thyroid Reset restores nutrients from food first and supplements second, and that's the right order for your hair too.6 The table shows what a realistic serving of each food brings.

I recommend about 3 ounces of beef liver once a week unless your bloodwork shows vitamin A running high, since it's one of the richest foods in B vitamins and iron.6 Eat iron-rich foods with a vitamin C food alongside, because vitamin C helps you absorb the iron,15 and I'd rather you get that vitamin C from a whole orange or red pepper than from a tablet.16 And when you eat eggs, eat them whole, yolks included.

For iron and zinc, I also recommend grass-fed beef and lamb.67 The World Health Organization's cancer agency classifies processed meat as a Group 1 carcinogen and red meat as Group 2A, probably carcinogenic to humans.29 In my view, the studies that link red meat to poor health mostly reflect grain-fed and processed meat, not the fresh, grass-fed red meat I recommend.30

What you take out matters as much as what you add. These are the foods I tell people to avoid for their hair: trans fats, which cause inflammation that throws off your hormones and raises DHT; sugar, which feeds inflammation and Candida, a yeast whose overgrowth cuts how much zinc and vitamin D you absorb; processed and fried foods; and too much caffeine and alcohol.8 One cup of coffee a day is fine for most people, but three or more can make cortisol skyrocket, and too much alcohol drains the B vitamins your hair needs.8 For more ideas, see our list of the best foods for your hair.

The best vitamins and hair growth supplements, ranked

The list starts with the nutrients you can test for and rebuild with food, and each card's badge shows the strength of the human research behind it.

Thyroid hair loss: what to check

Over the years I've sat across from thousands of people, most of them women, with the same story: bone-deep fatigue, cold hands, thinning hair, brain fog, low mood, and a lab report that says everything is normal.6 My Hypothyroidism Protocol lists seven drivers of a slow thyroid, from a leaky gut and autoimmunity to nutrient depletion and chronic stress, and most patients I see have several of these running at once.6

The same link shows up when researchers look at large groups. In a descriptive study of 1,232 people with hair loss in Kerala, India, with no comparison group, all tested for TSH and thyroid antibodies, thyroid problems became more common with age across every pattern of hair loss.11

Like your follicles, the thyroid needs raw materials to make and activate its hormone. Selenium runs the enzymes that turn T4 into active T3, and my protocol supplies it as 200 mcg a day or as 2 Brazil nuts.619 Brazil nuts really do the job: in a 12-week randomized trial of 59 adults, two a day raised blood selenium as much as a 100 mcg selenium supplement, though their selenium varied from nut to nut, about 53 mcg a day on average.28 Get iodine from food, such as sea vegetables, wild fish and eggs: enough, not mega.6 Iron and vitamin D matter here as much as anywhere. On my Thyroid Reset, low iron and vitamin D are the two most common reasons hair, energy and thyroid conversion don't improve, so test them, correct them and retest.6

Stress hair loss: how to calm cortisol

If you've been under physical or emotional stress, it can thin your hair.13 Stress hormones can hold follicles in their resting phase, as the mouse research in the cascade above showed,18 and high cortisol also blocks the conversion of thyroid hormone into its active form.6

If emotional stress is what you're dealing with, the supplements I point to are ashwagandha, rhodiola and B vitamins,8 and our list of natural stress relievers has more ideas. My tip goes past supplements, though: write down everything that's stressing you, work out how to deal with each one better or get it off your plate, then write down the five things you love doing most that you can do locally, and make regular time for them.8

Worry about thinning hair can feed the very stress behind it, and Jesus reminded His followers how closely God cares for them: "But even the very hairs of your head are all numbered. Fear not therefore: ye are of more value than many sparrows" (Luke 12:7).50

Rosemary oil for regrowth on the scalp

For the scalp itself, rosemary oil is one of the best oils out there for naturally thickening your hair, and its evidence for regrowth is good.846 In a randomized trial of 100 adults with pattern hair loss, rosemary oil regrew hair about as well as the drug minoxidil 2% over 6 months, with less scalp itching. Neither group's hair count changed at 3 months, so give it the full six.51

Mix 3 to 5 drops into a tablespoon of a carrier oil such as olive oil and massage it into your scalp 2 to 3 times a week.468 My homemade hair thickener goes further: rosemary, cedarwood and sage oils, 30 drops of each, in a jojoba and grapeseed oil base, rubbed into your scalp three times a week for 20 minutes before you shower.8 Our guide to hair loss remedies has more scalp treatments.

A 90-day plan for thicker hair

Hair vitamin side effects and who should be careful

Interaction check: Moderate. Thyroid medication, such as levothyroxine: take iron and calcium at least 4 hours apart from it, and ask first before adding ashwagandha, which may raise thyroid hormone.646 Blood thinners, such as warfarin: omega-3s, saw palmetto and dong quai can add to their effect, while vitamin K2 can blunt that effect even at low doses, so check with your prescriber before combining any of them.40465253 Quinolone and tetracycline antibiotics, such as ciprofloxacin: zinc binds them in the gut, so take the antibiotic at least 2 hours before or 4 to 6 hours after zinc.54

Biotin and lab tests. The FDA warns that biotin can cause incorrect lab results that may go undetected, including falsely low troponin, a heart-attack marker.55 In a study of 6 healthy adults, each tested before and after a week of 10 mg of biotin a day, biotin skewed 9 of 23 lab tests that rely on biotin in their chemistry, among them thyroid and vitamin D tests.56 Stop biotin 2 to 3 days before testing.19

Too much vitamin A or selenium. Too much of either can contribute to hair loss.1 Three ounces of beef liver holds 6,579 µg of vitamin A, more than twice the adult upper limit for preformed vitamin A, 3,000 µg a day, which is why once a week is the amount I recommend.2157 If you're pregnant or might be, skip vitamin A supplements above 3,000 µg a day, and confirm liver with your OB.57 When a liquid supplement turned out to hold 200 times its labeled selenium, 72% of the 201 people who took it lost hair, so keep supplemental selenium at or under 200 mcg a day.5819

Iron. Take iron only when ferritin is low, then retest, since too much iron is harmful; with hereditary hemochromatosis or a high ferritin, skip it.759 Men and postmenopausal women with low iron need a doctor's check for hidden blood loss, often from the gut.59

Zinc. Stay within 15 to 30 mg a day. The adult upper limit is 40 mg,54 and for long-term use, pair zinc with 1 to 2 mg of copper.7

Fo-ti. Fo-ti has been used safely for hundreds of years, but high doses may harm the liver, so stay at the traditional dose.17 In a review of 450 reported cases of fo-ti liver injury, most tied to long-term or high-dose use, yellowing skin or eyes, fatigue, poor appetite and dark urine showed up about a month in, and 98% recovered or improved after stopping, so stop it and get your liver checked if you notice any of these.60

Pregnancy, seizures and Hashimoto's. Skip saw palmetto while pregnant, and skip rosemary oil while pregnant or if you have a seizure disorder.46 While pregnant or nursing, avoid other concentrated herbs, such as dong quai, fo-ti, ginseng and ashwagandha, unless your practitioner approves.46 With Hashimoto's or high thyroid antibodies, avoid kelp and high-dose iodine unless you've been tested and advised.19

When to see a doctor. Patchy bald spots, hair loss with scalp pain, redness or scarring, and shedding that comes with weight change, exhaustion or other new symptoms all need a diagnosis, since thyroid disease, iron loss and autoimmune conditions such as alopecia areata can sit behind them.1159

The bottom line

Vitamins for hair growth: frequently asked questions

References

1. Almohanna HM, Ahmed AA, Tsatalis JP, Tosti A. The Role of Vitamins and Minerals in Hair Loss: A Review. Dermatol Ther (Heidelb). 2019;9(1):51-70. doi:10.1007/s13555-018-0278-6. PMID:30547302
2. Guo EL, Katta R. Diet and hair loss: effects of nutrient deficiency and supplement use. Dermatol Pract Concept. 2017;7(1):1-10. doi:10.5826/dpc.0701a01. PMID:28243487
3. Moeinvaziri M, Mansoori P, Holakooee K, Safaee Naraghi Z, Abbasi A. Iron status in diffuse telogen hair loss among women. Acta Dermatovenerol Croat. 2009;17(4):279-84. PMID:20021982
4. Cho YH, Lee SY, Jeong DW, et al. Effect of pumpkin seed oil on hair growth in men with androgenetic alopecia: a randomized, double-blind, placebo-controlled trial. Evid Based Complement Alternat Med. 2014;2014:549721. doi:10.1155/2014/549721. PMID:24864154
5. Hwang S, Won J, Kim S, Kang W, Park M. Low-Molecular-Weight Collagen Peptide Supplementation Improves Cellulite Severity, Skin Elasticity, and Hair Shaft Diameter: A Clinical Study with Pharmacokinetic Evaluation. J Med Food. 2026;29(4):187-195. doi:10.1177/1096620X261428336. PMID:41788055
6. Axe J. The Hypothyroidism Protocol. DrAxe.com protocol. 2026 (p. 3, "A Personal Note": thousands of people, most of them women, with thinning hair and normal labs; p. 4, "When thyroid hormone is low, everything slows at once: metabolism, body temperature, heart rate, digestion, mood, hair and skin."; p. 7, the seven drivers and "Most patients I see have several of these running at once.", cortisol blocks T4-to-T3 conversion; p. 12, collagen peptides 10–20 g daily and bone broth daily; p. 13, Step 3 Nourish: food first, supplements second; grass-fed liver once weekly; selenium 200 mcg or 2 Brazil nuts; iodine from sea vegetables, wild fish and eggs, "Enough, not mega"; iron with a vitamin C pairing; avoid list "Low-protein or crash dieting" and "Iron/calcium within 4 hrs of thyroid meds"; "hair regrowth over 8–12 weeks"; retest ferritin and vitamin D at 90 days; p. 15, calm cortisol with adaptogens, ashwagandha; p. 19, supplement protocol: zinc 15–30 mg with food, vitamin D3 + K2 2,000–5,000 IU dosed to labs, omega-3 (EPA/DHA) 2–3 g daily with food, iron bisglycinate only if ferritin is low with vitamin C; p. 25, "Low iron and D are the two most common reasons hair, energy and conversion don't improve.").
7. Axe J, Cole W. The 25 Root-Cause Bloodwork Markers That Matter Most. DrAxe.com protocol. 2026 (marker 10, vitamin D: functional range 50–80 ng/mL, 20–30 minutes of midday sun on bare skin daily, take with a fat-containing meal, pair with magnesium, required for vitamin D activation; marker 13, ferritin and full iron panel: functional range women 50–150, men 75–150 ng/mL, "Low ferritin causes fatigue, hair loss, restless legs," low: red meat, liver, sardines plus vitamin C; marker 14, RBC zinc, more accurate than serum, beef, lamb and pumpkin seeds, 15–30 mg with food, long-term pair with 1–2 mg copper, take away from calcium and iron; marker 16, copper and zinc balance; marker 17, thyroid panel).
8. Axe J. 6 Home Remedies for Hair Loss. The Dr. Axe Show. 2017 (pumpkin seed oil at 4:21; ashwagandha as an Ayurvedic adaptogen at 4:39; three causes of hair thinning, DHT, nutrients and cortisol, at 4:54; zinc 15 to 30 mg a day at 7:08; "I've worked with thousands of patients on helping them naturally thicken their hair" at 7:13; ashwagandha, rhodiola and B vitamins for emotional stress at 7:55; daily bone broth at 9:27; stress tip at 11:38; rosemary oil for thickening hair at 0:55, massaged in with olive oil at 1:00; homemade hair thickener (jojoba and grapeseed oil with cedarwood, rosemary and sage oils, 30 drops each, three times a week for 20 minutes) at 2:01; saw palmetto, pygeum and pumpkin seed oil for blocking DHT at 7:21; foods to avoid at 9:40 (trans fats at 9:42, sugar and Candida cutting zinc and vitamin D absorption at 9:51, processed and fried foods at 10:13, caffeine at 10:21, alcohol and B vitamins at 10:52); YouTube https://www.youtube.com/watch?v=LYPb7y_-350).
9. Milani M, Colombo F; GFM-O-Trial Investigators Group. Efficacy and tolerability of an oral supplement containing amino acids, iron, selenium, and marine hydrolyzed collagen in subjects with hair loss (androgenetic alopecia, AGA or FAGA or telogen effluvium). A prospective, randomized, 3-month, controlled, assessor-blinded study. Skin Res Technol. 2023;29(6):e13381. doi:10.1111/srt.13381. PMID:37357646
10. Rushton DH. Nutritional factors and hair loss. Clin Exp Dermatol. 2002;27(5):396-404. doi:10.1046/j.1365-2230.2002.01076.x. PMID:12190640
11. Vincent M, Yogiraj K. A Descriptive Study of Alopecia Patterns and their Relation to Thyroid Dysfunction. Int J Trichology. 2013;5(1):57-60. doi:10.4103/0974-7753.114701. PMID:23960405
12. Axe J. The SIBO Protocol. DrAxe.com protocol. 2026 (p. 13, protein, "The repair material": "Poor digestion and fermentation reduce how much protein you absorb. Weakness, slow recovery, thinning hair.").
13. Axe J. How To Get Thicker Hair Naturally. Dr. Josh Axe on YouTube. 2017 (a protein powder from bone broth or a collagen powder, "it's what I prescribe and recommend my patients use," at 2:04, and collagen's proline, hydroxyproline and glycine at 2:10; "I've noticed the biggest difference in people thickening their hair when they consume collagen" at 2:24; his sister's email at 2:30; the root cause of hair thinning at 6:34; physical and emotional stress at 6:40; too many carbohydrates, sugars and grains causing inflammation that raises DHT at 7:06).
14. Rasheed H, Mahgoub D, Hegazy R, et al. Serum ferritin and vitamin d in female hair loss: do they play a role? Skin Pharmacol Physiol. 2013;26(2):101-7. doi:10.1159/000346698. PMID:23428658
15. Axe J. The Real Reason You Wake Up Tired Every Morning. The Dr. Josh Axe Show, Episode 377. August 3, 2026 (iron-rich foods with vitamin C at 9:48; iron plus vitamin C every other day at 10:01; "This is what we do in my clinic" at 10:15; "The rule is wrong." at 10:53; blood deficiency, thinning hair and a pale tongue at 11:18-11:49; some iron every other day, the herb dong quai and build-your-blood foods at 12:21; YouTube https://www.youtube.com/watch?v=UYvHrFB_g50).
16. Axe J, Cole W. Heal Your Cells. Avery; 2026 (protein chapter: "Every structure and process in your body depends on protein. It builds and maintains every tissue: your muscles, skin, hair, tendons, ligaments, bones, and even the lining of your gut." and women in their thirties to fifties who under-eat protein; vitamin C: "A whole orange or red pepper provides far more cellular benefit than an ascorbic-acid tablet."; dong quai: "A traditional Chinese 'blood tonic' herb used to nourish blood").
17. Axe J. Ancient Remedies: Secrets to Healing with Herbs, Essential Oils, CBD, and the Most Powerful Natural Medicine in History. Little, Brown Spark; 2021 ("Ancient Prescriptions," hair loss, p. 246: top 5 ancient prescriptions, fo-ti, "Historically known for stopping hair loss. Take 1,000 to 2,000 mg daily."; saw palmetto, "Good for male pattern loss"; bone broth, "High in collagen and hair-building amino acids. Drink 2 cups daily."; Panax ginseng, "Stimulates hair follicles. Take 500 mg twice daily."; and ashwagandha, "Balances cortisol and promotes hair growth."; other remedies include rehmannia. Fo-ti entry, "Your Ancient Pharmacy," pp. 115-116: "Although fo-ti has been used safely for hundreds of years, high doses of the herb may harm the liver.").
18. Choi S, Zhang B, Ma S, et al. Corticosterone inhibits GAS6 to govern hair follicle stem-cell quiescence. Nature. 2021;592(7854):428-432. doi:10.1038/s41586-021-03417-2. PMID:33790465
19. Axe J. The Hashimoto's Protocol. DrAxe.com protocol. 2026 (p. 13, "What your thyroid runs on": selenium, vitamin D, zinc ("low zinc also thins hair"), iron and ferritin, B12, iodine in balance, avoid kelp and high-dose iodine unless tested and advised, selenium at or under 200 mcg a day from supplements; p. 14, "Stop biotin 2–3 days before testing — it can distort thyroid results.").
20. Durusu Turkoglu IN, Turkoglu AK, Soylu S, Gencer G, Duman R. A comprehensive investigation of biochemical status in patients with telogen effluvium: Analysis of Hb, ferritin, vitamin B12, vitamin D, thyroid function tests, zinc, copper, biotin, and selenium levels. J Cosmet Dermatol. 2024;23(12):4277-4284. doi:10.1111/jocd.16512. PMID:39107936
21. U.S. Department of Agriculture, Agricultural Research Service. Beef, variety meats and by-products, liver, cooked, pan-fried. FoodData Central, SR Legacy, FDC ID 168627 (NDB 13327). April 1, 2019.
22. U.S. Department of Agriculture, Agricultural Research Service. Lentils, mature seeds, cooked, boiled, without salt. FoodData Central, SR Legacy, FDC ID 172421 (NDB 16070). April 1, 2019.
23. U.S. Department of Agriculture, Agricultural Research Service. Seeds, pumpkin and squash seed kernels, dried. FoodData Central, SR Legacy, FDC ID 170556 (NDB 12014). April 1, 2019.
24. U.S. Department of Agriculture, Agricultural Research Service. Fish, sardine, Atlantic, canned in oil, drained solids with bone. FoodData Central, SR Legacy, FDC ID 175139 (NDB 15088). April 1, 2019.
25. U.S. Department of Agriculture, Agricultural Research Service. Fish, salmon, Atlantic, wild, cooked, dry heat. FoodData Central, SR Legacy, FDC ID 171998 (NDB 15209). April 1, 2019.
26. U.S. Department of Agriculture, Agricultural Research Service. Egg, whole, cooked, hard-boiled. FoodData Central, SR Legacy, FDC ID 173424 (NDB 1129). April 1, 2019.
27. U.S. Department of Agriculture, Agricultural Research Service. Nuts, brazilnuts, dried, unblanched. FoodData Central, SR Legacy, FDC ID 170569 (NDB 12078). April 1, 2019.
28. Thomson CD, Chisholm A, McLachlan SK, Campbell JM. Brazil nuts: an effective way to improve selenium status. Am J Clin Nutr. 2008;87(2):379-84. doi:10.1093/ajcn/87.2.379. PMID:18258628
29. Bouvard V, Loomis D, Guyton KZ, et al. Carcinogenicity of consumption of red and processed meat. Lancet Oncol. 2015;16(16):1599-600. doi:10.1016/S1470-2045(15)00444-1. PMID:26514947
30. Axe J. 10 Biblical Superfoods That Can Add Years to Your Life. The Dr. Josh Axe Show, Episode 393. September 28, 2026 (red-meat studies and grain-fed meat at 21:03; YouTube video 9AnNi1umufc).
31. Kantor J, Kessler LJ, Brooks DG, Cotsarelis G. Decreased serum ferritin is associated with alopecia in women. J Invest Dermatol. 2003;121(5):985-8. doi:10.1046/j.1523-1747.2003.12540.x. PMID:14708596
32. Aksu Cerman A, Sarikaya Solak S, Kivanc Altunay I. Vitamin D deficiency in alopecia areata. Br J Dermatol. 2014;170(6):1299-304. doi:10.1111/bjd.12980. PMID:24655364
33. Sattar F, Almas U, Ibrahim NA, Akhtar A, Shazad MK, Akram S, Khan MSN, Murtaza G. Efficacy of Oral Vitamin D3 Therapy in Patients Suffering from Diffuse Hair Loss (Telogen Effluvium). J Nutr Sci Vitaminol (Tokyo). 2021;67(1):68-71. doi:10.3177/jnsv.67.68. PMID:33642467
34. Kil MS, Kim CW, Kim SS. Analysis of serum zinc and copper concentrations in hair loss. Ann Dermatol. 2013;25(4):405-9. doi:10.5021/ad.2013.25.4.405. PMID:24371385
35. Jamilian M, Foroozanfard F, Bahmani F, Talaee R, Monavari M, Asemi Z. Effects of Zinc Supplementation on Endocrine Outcomes in Women with Polycystic Ovary Syndrome: a Randomized, Double-Blind, Placebo-Controlled Trial. Biol Trace Elem Res. 2016;170(2):271-8. doi:10.1007/s12011-015-0480-7. PMID:26315303
36. Park H, Kim CW, Kim SS, Park CW. The therapeutic effect and the changed serum zinc level after zinc supplementation in alopecia areata patients who had a low serum zinc level. Ann Dermatol. 2009;21(2):142-6. doi:10.5021/ad.2009.21.2.142. PMID:20523772
37. Axe J. Burn Fat, Build Muscle, Live a LOT Longer. The Dr. Josh Axe Show. 2026 (over 40, aim closer to 1 gram of protein per pound of body weight).
38. Axe J. Top 10 Reasons You're Not Healing. The Dr. Josh Axe Show. 2025 (30 to 40 grams of protein three times a day).
39. Axe J. The BIGGEST Causes of Fast-Aging Skin (How to Reverse Aging). The Dr. Josh Axe Show. 2025 (collagen a day at 12:18; zinc, copper and vitamin C for collagen production at 15:00; YouTube video tsTht-zHz-U).
40. Axe J. The Anti-Inflammatory Reset: The 30-Day Healing Protocol. DrAxe.com protocol. 2026 (p. 20, omega-3 (EPA/DHA) 2–3 g daily with food, and "Curcumin, ginger, omega-3s and boswellia can add to the effect of blood thinners — check with your prescriber if you take one."; top 10 foods: wild salmon and sardines, 4–6 oz three times weekly).
41. Le Floc'h C, Cheniti A, Connétable S, Piccardi N, Vincenzi C, Tosti A. Effect of a nutritional supplement on hair loss in women. J Cosmet Dermatol. 2015;14(1):76-82. doi:10.1111/jocd.12127. PMID:25573272
42. Trüeb RM. Serum Biotin Levels in Women Complaining of Hair Loss. Int J Trichology. 2016;8(2):73-7. doi:10.4103/0974-7753.188040. PMID:27601860
43. Soleymani T, Lo Sicco K, Shapiro J. The Infatuation With Biotin Supplementation: Is There Truth Behind Its Rising Popularity? A Comparative Analysis of Clinical Efficacy versus Social Popularity. J Drugs Dermatol. 2017;16(5):496-500. PMID:28628687
44. Draelos ZD, Jacobson EL, Kim H, Kim M, Jacobson MK. A pilot study evaluating the efficacy of topically applied niacin derivatives for treatment of female pattern alopecia. J Cosmet Dermatol. 2005;4(4):258-61. doi:10.1111/j.1473-2165.2005.00201.x. PMID:17168873
45. Beoy LA, Woei WJ, Hay YK. Effects of tocotrienol supplementation on hair growth in human volunteers. Trop Life Sci Res. 2010;21(2):91-9. PMID:24575202
46. Axe J. Top 50 Healing Herbs & Essential Oils. DrAxe.com protocol. 2026 (saw palmetto: berries a food and medicine for the Seminole; slows the conversion of testosterone to DHT, "the hormone that enlarges the prostate and thins hair"; hair thinning rated Emerging; extract 320 mg daily with food; Native American energetics, warming, sweet and pungent; "Avoid in pregnancy; ask first with blood thinners." Oil 08, rosemary, p. 43: hair regrowth rated Good evidence; scalp 3–5 drops in 1 Tbsp oil, 2–3 times weekly; avoid with seizure disorders and in pregnancy. Safety and interactions table: thyroid conditions, ashwagandha "may raise thyroid hormone," ask first with an overactive thyroid or on thyroid medication; pregnancy and nursing, "Avoid most concentrated herbs and oils unless your practitioner approves.").
47. Sudeep HV, Rashmi S, Jestin TV, Richards A, Gouthamchandra K, Shyamprasad K. Oral and Topical Administration of a Standardized Saw Palmetto Oil Reduces Hair Fall and Improves the Hair Growth in Androgenetic Alopecia Subjects - A 16-Week Randomized, Placebo-Controlled Study. Clin Cosmet Investig Dermatol. 2023;16:3251-3266. doi:10.2147/CCID.S435795. PMID:38021422
48. Yerram C, Jillella A, Reddy V. Effects of Withania somnifera root extract serum application on hair health in healthy adults: A prospective, double-blind, randomized, parallel, placebo-controlled study. J Ayurveda Integr Med. 2023;14(6):100817. doi:10.1016/j.jaim.2023.100817. PMID:38006746
49. Axe J. The Truth About Cortisol Face and The Exact Steps To Fix It. The Dr. Josh Axe Show, Episode 371. July 13, 2026 (ashwagandha, 300 mg twice a day, 600 mg daily, at 34:57; YouTube video 7xJRhK-04k8).
50. The Holy Bible, King James Version. Project Gutenberg eBook #10 (Luke 12:7).
51. Panahi Y, Taghizadeh M, Marzony ET, Sahebkar A. Rosemary oil vs minoxidil 2% for the treatment of androgenetic alopecia: a randomized comparative trial. Skinmed. 2015;13(1):15-21. PMID:25842469
52. Page RL 2nd, Lawrence JD. Potentiation of warfarin by dong quai. Pharmacotherapy. 1999;19(7):870-6. doi:10.1592/phco.19.10.870.31558. PMID:10417036
53. Theuwissen E, Teunissen KJ, Spronk HM, et al. Effect of low-dose supplements of menaquinone-7 (vitamin K2) on the stability of oral anticoagulant treatment: dose-response relationship in healthy volunteers. J Thromb Haemost. 2013;11(6):1085-92. doi:10.1111/jth.12203. PMID:23530987
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