Papain: What You Need to Know About This Proteolytic Enzyme

You may know of papaya as the orange-colored tropical fruit that’s consumed for its flavor and impressive nutrient profile, but how often do you think about its star compound papain?

Papain is a special enzyme that’s found in raw papaya. It’s popular in folk medicine due to its ability to break down proteins, aid digestion and reduce inflammation.

Like bromelain, which is found in pineapple, papain is available in many forms beyond simply eating papaya, including capsules and topicals. In fact, the two enzymes are commonly combined in commercial products for their anti-inflammatory and pain-relieving effects, and those aren’t the benefits of papain.

What is papain?

Papain is a proteolytic enzyme that’s found in papaya. The papaya fruit, Carica papaya, actually contains several proteolytic enzymes, including papain, chymopapain A, chymopapain B and papaya peptidase A.

The most well-known enzyme of the bunch, papain, is present in the immature fruit of the female papaya plant. It’s also in the leaves, roots and latex sap of the plant.

Ad

This enzyme helps break down the bonds between amino acids, the building blocks of proteins. Like all proteolytic enzymes, it breaks the long chain-like molecules of proteins into shorter fragments, called peptides, and then into their components, called amino acids.

The papaya enzyme has also been found to exhibit wound-healing, infection-fighting and pain-relieving effects.

What are the benefits of papain?

1. Aids digestion

Papain supplements are often used to improve gastrointestinal dysfunction and common digestive issues, like bloating and constipation.

Like other protease enzymes, studies show that papain helps the body break down protein foods, like animal meat, but this papaya enzyme does not require the presence of acid to do its job.

This means that even people with low stomach acid, who would usually have difficulty breaking down and digesting certain types of meat, may benefit from papain supplements.

Research published in the International Journal of Biological Macomolecules using human-related biological models found that papain actively breaks down proteins (such as immunoglobulins) into smaller fragments, demonstrating its ability to facilitate protein digestion at a biochemical level. This proteolytic activity supports easier digestion and nutrient absorption, especially for protein-rich foods, making it a helpful natural aid for those experiencing occasional digestive discomfort.

2. Helps manage inflammation

Papain has been shown to help reduce inflammation in patients with asthma, arthritis and other inflammatory conditions. In fact, proteolytic enzymes, including papain and trypsin, can break down pathogenic immune complexes and even prevent their formation in the first place.

This means that they may be able to prevent inflammation from occurring, thereby enhancing lymphatic drainage and having regulatory effects on the immune system.

A review of literature published in the Journal of Immunotoxicology found that both in vitro and in vivo studies have shown that papaya extracts and papaya-associated phytochemicals have anti-inflammatory and immunomodulatory properties.

In addition, a prospective study published in Cureus found that an oral enzyme combination containing papain helped reduce postoperative swelling, pain and trismus in patients after lower third molar surgery, compared with serratiopeptidase. Because papain was studied as part of a multi-enzyme formula rather than by itself, this study supports its potential role in helping manage inflammation during recovery, but it does not isolate papain’s independent effect.

3. Can relieve pain

Several studies have indicated that the papaya enzyme works to relieve pain in a number of areas, including muscle pain from intense workouts, sore throat pain and pain associated with shingles.

A study published in 2019 found that a papain-based gel called Papacarie was as effective in removing infected tissues among patients with caries, or decaying teeth, as conventional treatment. Research has revealed that the gel helps reduce pain and inflammation without the need for anesthesia or drilling during tooth removal.

Another study published in the Journal of Sports Science showed that taking a protease supplement containing the papaya enzyme may help relieve muscle pain that’s caused by running.

The participants consumed protease tablets that contained 50 milligrams of papain, in addition to other enzymes like bromelain, trypsin, amylase and lipase. After taking two tablets four times a day for four days, runners demonstrated superior recovery and reduced muscle soreness compared to the placebo group.

In addition, a 1995 German study evaluated the efficacy of an enzyme combination containing papain for herpes zoster, or shingles. Researchers found that the enzyme preparation showed identical efficacy with acyclovir, an antiviral medication that’s used to treat herpes virus infections.

Ad

The enzyme combination was able to reduce pain associated with shingles after 14 days of treatment.

4. May have anti-tumor effects

A human-based clinical review published in Anticancer Research evaluating proteolytic enzyme therapy (including papain) reported that these enzymes may support anti-tumor activity by improving immune response and enhancing outcomes of cancer treatments, as well as helping reduce tumor-related inflammation and treatment side effects.

The researchers explained that proteolytic enzymes can modulate immune function and break down protein structures associated with tumor protection, which may help expose cancer cells to immune attack and improve therapeutic response in patients.

5. Fights infections

Papain has been used in nontraditional wound care because of its antiviral and antifungal properties.

It appears that it works to fight infections by destroying the layer of protein that protects fungi and viruses against attacks. This decreases their ability to reproduce, spread and cause infections.

One study published in the Journal of Clinical Pediatric Dentistry demonstrated papain’s infection-fighting potential. When a papain-based gel was applied to infected dentin in extracted human teeth, it significantly reduced counts of Streptococcus mutans and Lactobacillus casei, two bacteria involved in dental infections.

The researchers concluded that this enzyme exerts antimicrobial effects by breaking down infected tissue and disrupting bacterial presence, thereby helping control infection at the site.

6. Supports wound healing

Topical papaya enzyme products are often used for their wound-healing effects, although the U.S. Food and Drug Administration has warned consumers about possible allergic reactions when applying the enzyme topically.

There are preliminary studies supporting the papaya enzyme’s ability to support wound healing.

For instance, a randomized clinical trial in patients with chronic venous ulcers found that 2 percent papain gel produced a greater reduction in ulcer area than 2 percent carboxymethylcellulose over 12 weeks, with increased epithelial tissue in the wound bed and two ulcers healing in the papain group. This supports wound healing by helping clear devitalized tissue and improving the wound bed so re-epithelialization can progress more effectively.

Risks and side effects

Papain is considered safe when it’s consumed in normal amounts found in foods, and it’s considered “possibly safe” when taken by mouth in appropriate amounts.

According to research published by the Mayo Clinic College of Medicine, consuming excessive amounts of the enzyme can lead to papain side effects, including stomach discomfort, throat irritation and gastritis.

There is concern about the possibility of allergic reactions when using creams or ointments made with the enzyme topically. If you have an allergy or sensitivity to papain, you may experience skin irritation, redness or blisters when you apply the enzyme to your skin.

It’s believed that people who are allergic to kiwi and fig may also be allergic to papain. People who experience allergy symptoms after being exposed to these fruits should definitely be cautious when using it topically or internally.

Because papain may lower blood pressure, people with diabetes and hypoglycemia should use the enzyme with caution and under the care of a healthcare professional.

The enzyme should not be consumed or used by people who are on blood thinners, as it may increase your bleeding risk. It’s also important to avoid using it at least two weeks before any scheduled surgery.

It’s not considered safe to use papain supplements during pregnancy or while nursing.

Sources and dosage

Papain is available in several forms, including as capsules, tablets, powders, chewable gummies, creams and ointments.

There are no official guidelines for the use of this enzyme. Dosages that fall between 25 to 100 milligrams daily are generally considered safe.

It’s best to consult your healthcare professional before using it in order to pinpoint an appropriate dosage for your health needs.

Consuming too much papain can lead to adverse side effects, so avoid exceeding 400 milligrams per day unless advised otherwise by your doctor. There is some evidence that taking higher amounts (up to 1,500 milligrams per day by mouth) of the enzyme can be beneficial, but this should be approved by your doctor.

Papain topicals, including creams and ointments, can be applied to areas of inflammation, redness, burning sensation and pain. Before using the topical on a large surface area, perform a patch test to rule out an allergy or sensitivity to the enzyme.

Frequently asked questions

What is papain?

Papain is a natural digestive enzyme derived from the papaya fruit (Carica papaya). It helps break down proteins into smaller peptides and amino acids, supporting digestion and nutrient absorption.

What does papain do in the body?

It acts as a proteolytic enzyme, meaning it digests proteins. In the body, it may:

• Support protein digestion
• Reduce bloating and indigestion
• Aid nutrient absorption
• Help break down tough or hard-to-digest foods

What foods contain papain?

It is primarily found in raw (unripe) papaya and papaya latex, the milky substance in the fruit’s skin. Ripe papaya contains less active papain compared to unripe fruit.

Is papain good for digestion?

Yes. It is commonly used as a digestive aid because it helps break down dietary proteins. This may improve digestion, especially for people with low stomach acid or difficulty digesting protein-rich meals.

What are the benefits of papain?

Potential benefits of papain include:

• Improved protein digestion
• Reduced bloating and gas
• Support for gut health
• Anti-inflammatory properties
• Assistance with wound healing (topical use)

Does papain help with inflammation?

This enzyme may have mild anti-inflammatory effects. It is sometimes included in enzyme blends used to support recovery, reduce swelling and promote tissue repair, though results vary by individual.

Is papain the same as bromelain?

No, but they are similar. Papain comes from papaya, while bromelain comes from pineapple. Both are proteolytic enzymes that help digest protein and support inflammation balance.

Can papain help with bloating?

It may help reduce bloating caused by poor protein digestion. By breaking down proteins more efficiently, it can decrease fermentation in the gut that leads to gas and discomfort.

Is papain safe to take?

This enzyme is generally considered safe when used in appropriate amounts. However:

• High doses may cause irritation
• People allergic to papaya or latex should avoid it
• Pregnant individuals should consult a healthcare provider

What are papain supplements used for?

Papain supplements are used to:

• Support digestion
• Improve protein breakdown
• Reduce post-meal discomfort
• Complement enzyme blends for gut health

Does papain help with meat tenderizing?

Yes. It is widely used as a natural meat tenderizer because it breaks down muscle proteins, making meat softer and easier to chew.

Can papain help with sinus or respiratory issues?

It is sometimes included in enzyme formulas aimed at reducing mucus and inflammation, but evidence is limited. It may provide mild support when used alongside other enzymes.

How does papain compare to digestive enzymes?

Papain is a type of digestive enzyme, specifically one that targets proteins. Comprehensive digestive enzyme blends may also include amylase (carbohydrates), lipase (fats) and lactase (dairy). Papain is often one component of broader formulas.

When should you take papain?

It is typically taken with meals to support digestion or between meals for systemic enzyme support (in some protocols). Always follow product-specific guidance.

Are there side effects of papain?

Possible side effects include:

• Stomach irritation (in high doses)
• Allergic reactions (rare but possible)
• Interaction with certain medications (like blood thinners)

Is papain good for skin or wound healing?

It is sometimes used topically in skin care and wound care because it can help remove dead tissue and support healing. However, use should be guided by a professional.

Who should not take papain?

Avoid this enzyme if you:

• Have a papaya or latex allergy
• Are pregnant (unless advised by a doctor)
• Take anticoagulant medications without medical supervision

Does papain help break down gluten?

It breaks down proteins but is not specifically effective for gluten digestion in individuals with celiac disease. It should not be relied on as a gluten-protection strategy.

Is papain natural or synthetic?

It is a naturally occurring enzyme extracted from papaya. Most supplements use purified natural papain.

How is papain extracted?

This enzyme is extracted from the latex of unripe papaya fruit. The latex is collected, dried and processed into powder or supplement form.

Final thoughts

• The papain definition is a proteolytic enzyme that comes from the papaya plant. It works to break down proteins into amino acids.
• There are many papain preparations. The enzyme is commonly taken in supplement form or applied topically to reduce inflammation, promote wound healing, aid digestion and fight pain.
• Sometimes it’s combined with other beneficial enzymes, like bromelain and trypsin.
• Doses between 25 to 100 milligrams are considered safe for most people using papaya pills or supplements. A higher dose should be cleared with your healthcare professional.
• Before using the enzyme topically, perform a patch test to ensure that you don’t have an allergy.