Clear Protein Powder: Benefits, vs. Whey & Side Effects

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Shake a scoop of clear protein into cold water and you get something that looks like lemonade, thin and see-through, with none of the milky body of a regular shake. Underneath, clear whey is still whey. Clear whey is whey protein isolate, whey filtered until the dry powder is at least 90% protein, then made slightly acidic, to about pH 3.3, so the protein stays dissolved and the drink stays clear.12

Protein is the nutrient I focus on most for building muscle and burning fat.8 Protein and protein powders top my list of foods that support GLP-1, the gut hormone that helps you feel full, and whey protein isolate leads that list.9 That's the protein in a scoop of clear whey. Clear plant proteins and clear collagen drinks are on the shelf too, and they're different proteins.

Clear whey keeps what makes whey worth drinking in a lighter, juice-like form, and like any powder, it's only as good as what's on its label.

Did you know?

• In a lab comparison of animal and plant protein isolates, whey had the highest share of essential amino acids, 43% of its protein.10

• The faint soapy taste a clear protein drink can carry comes from medium-chain fatty acids naturally present in whey isolate, which taste soapy at pH 3.3 but not at pH 6.3.2

• Whey protein isolate has a high foaming ability, which is why a freshly shaken clear drink can wear a thick layer of foam.1

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What is clear protein?

Whey is the liquid part of milk, and the whey in an isolate can come from what's left over when cheese is made or be filtered straight from skim milk.11 Filtering removes most of what isn't protein, typically leaving just 0.5% to 1% lactose and 0.5% to 1% fat in the powder.1 As a protein, whey isolate scores 1.00 on PDCAAS and 1.09 on DIAAS, two standard ratings of protein quality where 1.00 or above means a protein meets every essential amino acid need.1

Why is clear protein clear?

Acidity does it. Heat a whey drink and a little of the protein clumps together and clouds it, but in a food-science study, whey drinks at pH 3.6 and below stayed essentially clear before and after heating.12 A 2026 study pinned down the switch point: whey isolate drinks stayed optically clear from pH 3.0 to just under 3.5, turned cloudy at 3.5 and above, and held up to about 8% protein while staying clear and stable.11 Clear protein drinks are made at about pH 3.3, the acidity where whey isolate stays dissolved.2

Clear plant and collagen versions

Clear protein has branched out beyond whey. Clear plant proteins, such as pea protein, are dairy-free, and clear collagen drinks, sometimes sold as protein water, are made from collagen peptides. Here's how the three compare as proteins:

Pea protein is a complete protein. In a randomized trial of 15 adults, run with a pea protein maker, 93.6% of its amino acids were absorbed by the end of the small intestine, against 96.8% for milk casein, a difference small enough to be chance.13 It carries a little less leucine than whey, so a pea serving runs larger: about 38 grams of pea protein supplies the 2.7 grams of leucine in 25 grams of whey.10

Collagen is a different kind of protein. It has no tryptophan, one of the nine essential amino acids, so it counts as an incomplete protein, and it carries far less leucine, the amino acid that signals muscle to build: about 0.7 grams in 25 grams of collagen protein, by USDA's record for gelatin, against 2.7 grams in 25 grams of whey.141510 It still fits well in your day. A modeling study found that collagen peptides could supply up to 36% of the protein in a typical Western diet while every essential amino acid need was still met.15

If you have 20 grams of collagen, I'd count it toward about 10 grams of protein, because building muscle depends on amino acids like leucine and valine.8 Collagen and whey also work well together. In a placebo-controlled trial of 28 young men, 14 per group, where neither the men nor the researchers knew who got what, a drink of 25 grams of whey plus 5 grams of collagen after leg exercise raised muscle protein building in the worked leg to 0.052% an hour, against 0.039% on the placebo, and it raised connective-tissue protein building in the rested leg too.16

Clear protein vs. whey: what's the difference?

Clear whey and a regular whey shake can carry exactly the same protein. When both are made from whey protein isolate, you get the same complete, fast-absorbed protein either way, and what changes is the drink around it. A regular whey powder may be isolate, a less filtered whey concentrate or a blend of the two, so check which one the label lists.1

Whichever style you choose, the whey itself matters most, and the label section shows what to look for.

What is clear protein good for?

How does clear whey work in your body?

Here's the path from the scoop to your muscles, one step at a time.

Clear protein benefits, ranked by evidence

Ranked by the strength of the human research, whey isolate's benefits start with muscle and strength with training, then fast muscle building after a workout and lower blood sugar after meals, followed by muscle and function as you age, fullness and recovery after hard exercise.

How much clear protein should you have?

Spread that total across the day. At 150 pounds, for example, 0.7 to 1 gram per pound comes to 105 to 150 grams of protein a day. For most people, I recommend at least 30 to 40 grams of protein three times a day, and I get about 40 grams four times a day myself, including a protein shake right after my workout.258 Use our guide to how much protein you need to work out your own number, and if you have kidney disease, read the kidney note first.

The best dose of whey after a workout has been tested directly. In a trial of 48 resistance-trained young men who ate a high-protein breakfast, worked one leg 3 hours later and then drank 0, 10, 20 or 40 grams of whey isolate in 500 ml of water, 12 men to each dose, 20 grams raised muscle protein building about 49% above the 0-gram drink over 4 hours, measured across the worked and the rested leg. Forty grams raised it about 56%, no different from 20 grams, and 10 grams did no better than none. The 40-gram drink also raised amino acid burning and urea production, a sign the body was using the extra protein for fuel instead of building with it.4

The kind of workout matters too. In a randomized trial of 30 resistance-trained young men who each tried both doses after a whole-body workout, where neither the men nor the researchers knew which dose was which, 40 grams of whey isolate in 500 ml of water raised muscle protein building about 20% more than 20 grams did.6

Older muscles want more. In a randomized trial of 37 men averaging 71 years old who worked one leg and then drank 0, 10, 20 or 40 grams of whey isolate, 40 grams raised muscle protein building in the exercised leg about 32% more than 20 grams did, and at rest, 20 and 40 grams raised it about 65% and 90% above fasting levels.5 The researchers concluded that, unlike young adults, older men's exercised muscles respond to the higher dose, so if you're older, or you train your whole body in one session, a full 40-gram serving after training makes sense.

The International Society of Sports Nutrition puts the daily target for most people who exercise at 1.4 to 2.0 grams of protein per kilogram of body weight, about 0.64 to 0.91 grams per pound, in servings of 20 to 40 grams every 3 to 4 hours, and it found that protein before or after a workout both work.26 My range of 0.7 to 1 gram per pound sits at the top of that and a little above it. When you buy a clear whey, check the label for at least 20 grams of protein per scoop.

When should you drink clear protein?

Around your workouts is the natural time. Whey acts very quickly on your muscles, and I call it the ideal protein to take during your workouts.9 In the dose trials above, the drink came right after exercise.465 Breakfast is the other good spot, as the next section explains.

Is clear protein filling, and can it help with weight loss?

Texture turns out to matter. In a study of 26 healthy young men who each tried four 300-gram drinks on different days, followed by a pasta lunch 30 minutes later, a thin, juice-style drink with about 33 grams of protein, including whey isolate, was followed by 623 grams of lunch, close to the 668 grams after a low-energy drink with 1.6 grams of protein. A thick, creamy drink with about the same protein cut lunch to 566 grams, significantly less than the thin one, and a thick, creamy carbohydrate drink brought it to 572 grams.27 The researchers concluded that thickness and creaminess are a big part of why protein fills you up; a food company's research arm funded the work.

So put clear whey where it works best. Have it with breakfast alongside food, such as eggs or Greek yogurt, or right after a workout, when quick protein matters more than feeling full. For a drink that holds you longer, blend it with frozen fruit and ice to thicken it.

When weight is the goal, the protein you eat across the day does the work. In my Healthy Weight & Metabolic Reset protocol, the first step each morning is 30 grams of protein within an hour of waking, and a protein shake is one of the options.28 As I wrote on page 8 of that protocol, "Put 30 g of protein in at breakfast and walk after lunch, and the craving loses its voice."28

What should you look for on a clear protein label?

In Heal Your Cells, Dr. Will Cole and I recommend high-quality animal or plant protein powders, and we both take protein powder every day, from bone broth and from organic plant protein.31 With a clear protein, quality comes down to three things on the label: the protein, the sweetener and the extras.

Sweeteners deserve the closest look. The Biblio Diet names artificial sweeteners one of the Sinister Six, the six foods and ingredients to cut first, and notes that acesulfame potassium is commonly used in protein powders.30

A 2022 randomized trial shows what that looks like in people. Researchers gave 120 healthy adults, 20 in each of six groups, sachets of saccharin, sucralose, aspartame or stevia for 2 weeks, at amounts below the official acceptable daily intake, or a glucose or no-sachet control, and saccharin and sucralose significantly impaired the body's blood sugar response.32 Honey is my number-one sweetener, and after that monk fruit, stevia and allulose.29 If an unsweetened powder needs sweetening, stir in a little raw honey yourself, sparingly.

• Whey protein isolate as the protein, ideally from organic, grass-fed, A2 milk, the whey I consider best.8

• At least 20 grams of protein per scoop, the smallest dose that gave young men the full response after a leg workout.4

• Unsweetened, or sweetened with stevia or monk fruit; skip sucralose, acesulfame potassium and aspartame.30

• No artificial colors, another of the Sinister Six.30

• Skip sugar alcohols such as sorbitol and maltitol, which I list among the sweeteners to avoid; they can upset a sensitive gut.30 If a label lists erythritol, know that in a 2023 observational study of adults being evaluated for heart risk, higher blood erythritol was linked with more major cardiovascular events, meaning heart attack, stroke or death.33

• Published heavy-metal testing from the maker, batch by batch; the safety section has the numbers.

How to use clear protein

Clear protein mixes best cold, and it takes well to a light hand in the kitchen.

Does clear protein hydrate you?

It hydrates you about as well as the water it's mixed with. In a study of 10 adults who each tried both drinks after losing about 2% of their body weight to sweat while cycling in the heat, water with 20 grams of whey isolate per liter rehydrated them as well as plain mineral water. They kept 37% of what they drank with whey and 40% with water, a difference small enough to be chance, and the liquid part of their blood ran a little higher at 3 and 4 hours with the whey drink.34 For long, sweaty sessions, see our guide to electrolyte drinks.

Clear protein side effects and who should be careful

Every body is different, so these are the situations where the protein, the amount or the timing should change:

• Milk allergy. Whey isolate still carries alpha-lactalbumin and beta-lactoglobulin, two of the main cow's milk allergens, so skip clear whey and every other whey or dairy protein.39

• Lactose intolerance. A 25-gram serving of whey isolate carries about 0.13 to 0.25 grams of lactose, and a review of 36 trials found that adults with lactose intolerance generally handle 12 to 15 grams, about a cup of milk.140

• Sensitivity to whey or dairy. Quite a few people are sensitive to whey and dairy themselves, apart from lactose. If that's you, I recommend switching to a plant-based protein, such as pea or rice protein, or to a beef or egg protein.89

• Your teeth. Clear drinks are acidic, about pH 3.3, and in a study comparing 300 people with acid wear on their teeth with 300 without it, holding or swishing acidic drinks before swallowing went with about 10 times the odds of wear.241 No study has tested clear protein on enamel, so drink it rather than sipping it for hours, don't swish it, and see the best and worst foods for your teeth.

• Acne. In a 6-month trial of 49 young men with acne, where neither the men nor the researchers knew who got what, 30 grams of whey a day didn't worsen acne compared with a supplement without whey.42

• Kidneys. Across 28 randomized trials with 1,358 healthy adults, higher-protein diets didn't harm kidney function.43 If you have chronic kidney disease, set your protein amount with the specialist who manages your kidney care, since kidney guidelines lower the daily target as filtration falls.4424

• Pregnancy, breastfeeding and children. No trial has tested clear protein in these groups, so food comes first: eggs, Greek yogurt, low-mercury fish such as wild salmon and other high-protein foods.

• Heavy metals. In a 2026 analysis of 30 sports protein powders sold in China, the dairy-based ones averaged 0.06 milligrams of lead and 0.01 milligrams of cadmium per kilogram, and at 30 grams a day the combined risk estimate stayed below the level of concern.45 Choose a maker that publishes batch test results.

• Sweeteners and sugar alcohols. Some clear powders use artificial sweeteners or sugar alcohols that can upset a sensitive gut; the label section shows what to choose.

The bottom line

Clear protein: frequently asked questions

References

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2. Best AR, Liu Y, Cadwallader D, Drake M. Sources of soapy off-flavor in clear acidic whey protein beverages. J Food Sci. 2025;90(3):e70044. doi:10.1111/1750-3841.70044
3. Morton RW, Murphy KT, McKellar SR, Schoenfeld BJ, Henselmans M, Helms E, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. 2018;52(6):376-384. doi:10.1136/bjsports-2017-097608
4. Witard OC, Jackman SR, Breen L, Smith K, Selby A, Tipton KD. Myofibrillar muscle protein synthesis rates subsequent to a meal in response to increasing doses of whey protein at rest and after resistance exercise. Am J Clin Nutr. 2014;99(1):86-95. doi:10.3945/ajcn.112.055517
5. Yang Y, Breen L, Burd NA, Hector AJ, Churchward-Venne TA, Josse AR, et al. Resistance exercise enhances myofibrillar protein synthesis with graded intakes of whey protein in older men. Br J Nutr. 2012;108(10):1780-8. doi:10.1017/S0007114511007422
6. Macnaughton LS, Wardle SL, Witard OC, McGlory C, Hamilton DL, Jeromson S, et al. The response of muscle protein synthesis following whole-body resistance exercise is greater following 40 g than 20 g of ingested whey protein. Physiol Rep. 2016;4(15):e12893. doi:10.14814/phy2.12893
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8. Axe J. Burn Fat, Build Muscle, Live a LOT Longer. The Dr. Josh Axe Show. 2026 (at 15:47, 18:02, 19:11, 19:56, 20:12, 30:44, 30:59, 31:15 and 32:05; YouTube https://www.youtube.com/watch?v=PKpftccZnv4).
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16. Aussieker T, Kaiser J, Hermans WJH, Hendriks FK, Holwerda AM, Senden JM, et al. Ingestion of a Whey Plus Collagen Protein Blend Increases Myofibrillar and Muscle Connective Protein Synthesis Rates. Med Sci Sports Exerc. 2025;57(3):544-554. doi:10.1249/MSS.0000000000003596
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18. Chiang SW, Liu HW, Loh EW, Tam KW, Wang JY, Huang WL, et al. Whey protein supplementation improves postprandial glycemia in persons with type 2 diabetes mellitus: A systematic review and meta-analysis of randomized controlled trials. Nutr Res. 2022;104:44-54. doi:10.1016/j.nutres.2022.04.002
19. Cermak NM, Res PT, de Groot LC, Saris WH, van Loon LJ. Protein supplementation augments the adaptive response of skeletal muscle to resistance-type exercise training: a meta-analysis. Am J Clin Nutr. 2012;96(6):1454-64. doi:10.3945/ajcn.112.037556
20. Nasimi N, Sohrabi Z, Nunes EA, Sadeghi E, Jamshidi S, Gholami Z, et al. Whey Protein Supplementation with or without Vitamin D on Sarcopenia-Related Measures: A Systematic Review and Meta-Analysis. Adv Nutr. 2023;14(4):762-773. doi:10.1016/j.advnut.2023.05.011
21. Chalé A, Cloutier GJ, Hau C, Phillips EM, Dallal GE, Fielding RA. Efficacy of whey protein supplementation on resistance exercise-induced changes in lean mass, muscle strength, and physical function in mobility-limited older adults. J Gerontol A Biol Sci Med Sci. 2013;68(6):682-90. doi:10.1093/gerona/gls221
22. Brown MA, Stevenson EJ, Howatson G. Whey protein hydrolysate supplementation accelerates recovery from exercise-induced muscle damage in females. Appl Physiol Nutr Metab. 2018;43(4):324-330. doi:10.1139/apnm-2017-0412
23. Volek JS, Volk BM, Gómez AL, Kunces LJ, Kupchak BR, Freidenreich DJ, et al. Whey protein supplementation during resistance training augments lean body mass. J Am Coll Nutr. 2013;32(2):122-35. doi:10.1080/07315724.2013.793580
24. Bauer J, Biolo G, Cederholm T, Cesari M, Cruz-Jentoft AJ, Morley JE, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc. 2013;14(8):542-59. doi:10.1016/j.jamda.2013.05.021
25. Axe J. Top 10 Reasons You're Not Healing. The Dr. Josh Axe Show. 2025 (at 8:19; YouTube https://www.youtube.com/watch?v=bjU77gf__x4&t=499s).
26. Jäger R, Kerksick CM, Campbell BI, Cribb PJ, Wells SD, Skwiat TM, et al. International Society of Sports Nutrition Position Stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20. doi:10.1186/s12970-017-0177-8
27. Bertenshaw EJ, Lluch A, Yeomans MR. Perceived thickness and creaminess modulates the short-term satiating effects of high-protein drinks. Br J Nutr. 2013;110(3):578-86. doi:10.1017/S0007114512005375
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39. Jensen SA, Fiocchi A, Baars T, Jordakieva G, Nowak-Wegrzyn A, Pali-Schöll I, et al. Diagnosis and Rationale for Action against Cow's Milk Allergy (DRACMA) Guidelines update - III - Cow's milk allergens and mechanisms triggering immune activation. World Allergy Organ J. 2022;15(9):100668. doi:10.1016/j.waojou.2022.100668
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42. Sompochpruetikul K, Khongcharoensombat T, Chongpison Y, Rittirongwattana W, Asawanonda P, Noppakun N, et al. Whey protein and male acne: A double-blind, randomized controlled trial. J Dermatol. 2024;51(7):1022-1025. doi:10.1111/1346-8138.17109
43. Devries MC, Sithamparapillai A, Brimble KS, Banfield L, Morton RW, Phillips SM. Changes in Kidney Function Do Not Differ between Healthy Adults Consuming Higher- Compared with Lower- or Normal-Protein Diets: A Systematic Review and Meta-Analysis. J Nutr. 2018;148(11):1760-1775. doi:10.1093/jn/nxy197
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Dr. Josh Axe, DC, DNM, CNS

Doctor of Natural Medicine · Founder, DrAxe.com

Dr. Axe is a certified doctor of natural medicine, clinical nutritionist, and multiple New York Times bestselling author. He has spent 20+ years in clinical practice helping people heal at the root cause and founded one of the most-visited natural-health platforms in the world.

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This article is for educational purposes. See our medical disclaimer.