Gelatin
Cooked, partially broken-down collagen from animal bones and skin, providing glycine, proline, and hydroxyproline; one well-designed trial showed gelatin with vitamin C before exercise doubled collagen synthesis markers, and it shares most of the joint and skin evidence of hydrolyzed collagen.
At a Glance
- Best known for
- Increases collagen synthesis markers when taken before exercise (with vitamin C), Supports joint, tendon, and ligament health, Rich source of glycine (about 20% by weight)
- Evidence
- Moderate
- Typical dose
- 15 g gelatin + 50 mg vitamin C, 30–60 min before exercise
- Type
- Amino Acid
What is Gelatin?
Gelatin is what collagen becomes when it is cooked: the triple-helix protein in animal skin, bones, and connective tissue unwinds and partially breaks into shorter chains that dissolve in hot water and set into a gel when cooled. It is the same substance that makes bone broth jiggle when refrigerated, that forms the base of jelly desserts, gummies, and marshmallows, and that coats medicine capsules. Nutritionally it is a nearly complete amino acid profile except for tryptophan, unusually rich in glycine and proline, the amino acids the body needs to build its own collagen. It differs from 'collagen peptides' only in degree of breakdown — gelatin chains are longer and gel, while hydrolyzed collagen is broken further into small peptides that dissolve in cold water and do not gel.
Known Health Benefits
How It Works
Gelatin is digested into amino acids and small peptides, particularly glycine, proline, and hydroxyproline-containing dipeptides like prolyl-hydroxyproline, which appear in the blood within an hour. These specific peptides are not just building blocks: they act as signals that stimulate fibroblasts in skin, tendons, and cartilage to produce more collagen and hyaluronic acid. Glycine is also needed for glutathione and creatine synthesis and acts as a calming neurotransmitter in the brain, which explains sleep-quality findings with glycine supplementation. Taking gelatin with vitamin C provides the cofactor for prolyl hydroxylase, the enzyme that stabilizes new collagen, and taking it shortly before exercise ensures these amino acids are circulating when loading stimulates collagen synthesis in tendons and ligaments.
What Research Says
The key gelatin-specific study is a 2017 randomized crossover trial from the Australian Institute of Sport in which 8 young men took 0, 5, or 15 g of gelatin with vitamin C one hour before 6 minutes of jump-rope exercise, three times a day for three days; the 15 g dose doubled a blood marker of collagen synthesis (P1NP), and serum from the gelatin-fed participants increased collagen production in engineered ligaments in the lab. Though small, this study underpins the widespread practice of 'gelatin before training' in sports medicine. Most other evidence comes from hydrolyzed collagen, which is nutritionally equivalent: multiple randomized trials and a 2019 meta-analysis show 2.5–10 g daily improves skin elasticity and hydration over 8–12 weeks, and trials in athletes and people with osteoarthritis show reduced joint pain with 10 g daily over 3–6 months. Separate glycine studies (3 g at bedtime) show improved subjective sleep quality. Limitations include small samples, industry funding of many collagen trials, and the fact that benefits are modest.
Active Compounds
Collagen-derived peptides rich in glycine, proline, hydroxyproline, and alanine; gels when cooled (unlike hydrolyzed collagen)
Forms & Bioavailability
Gelatin is well digested; about 90% of its amino acids are absorbed, and collagen-specific dipeptides and tripeptides appear in blood within 30–60 minutes and persist for several hours. Hydrolyzed collagen is absorbed slightly faster because its peptides are shorter, but the end result is similar. For connective tissue purposes, timing matters more than form: taking 15 g with vitamin C 30–60 minutes before exercise aligns peak amino acid levels with the mechanical signal to build collagen. Gelatin must be dissolved in hot liquid; adding it to cold liquids forms clumps. It can be 'bloomed' in cold water first, then dissolved with heat.
Dosage Guidance
| Use Case | Dosage |
|---|---|
| Tendon / ligament support with training (studied) | 15 g gelatin + 50 mg vitamin C, 30–60 min before exercise |
| Skin and joint support (daily) | 10 g daily |
| Glycine for sleep | 10–15 g gelatin in the evening (provides about 3 g glycine) |
| Culinary (bone broth) | 1–2 cups daily |
Always consult a healthcare provider for personalized dosing.
Natural Food Sources
- Bone broth and stock (especially from joints, feet, and knuckles)
- Slow-cooked meats with skin and connective tissue (oxtail, shanks, pork skin)
- Aspic and jellied meats
- Gelatin desserts, gummies, and marshmallows (with added sugar)
- Fish heads and skin (fish gelatin)
Potential Side Effects
Bloating, heaviness, or belching; unpleasant taste; rare allergic reactions; heartburn in some people
Who Should Avoid It
- Allergy to beef, pork, or fish (source-dependent)
- Religious or dietary restrictions (porcine or bovine source — check labeling)
- Protein-restricted diets (advanced kidney or liver disease)
- Histamine intolerance — long-simmered broths may be high in histamine, though gelatin powder is not
- Concern about bovine spongiform encephalopathy is historical; modern gelatin from regulated sources is considered safe
Pregnancy & Lactation
Gelatin is a food and is safe in pregnancy and breastfeeding in normal culinary amounts. Supplemental doses (10–15 g) have not been specifically studied in pregnancy but there is no known concern beyond its protein content. Avoid gelatin from unregulated sources.
Known Drug Interactions
No significant drug interactions known; may slightly enhance sedative effects via glycine at high doses; protein load relevant to those on protein-restricted diets
Evidence Classification
Supported by cohort studies, case-control studies, or multiple observational studies with consistent findings.
Frequently Asked Questions
Is gelatin the same as collagen peptides?
Nearly. Both come from animal collagen and have the same amino acid profile. Gelatin is cooked collagen with longer chains that gel when cooled; collagen peptides (hydrolyzed collagen) are broken down further into short chains that dissolve in cold liquids and do not gel. The body breaks both into the same peptides and amino acids, so for most purposes they are interchangeable. Gelatin is cheaper; collagen peptides are more convenient.
Why take gelatin before exercise?
Tendons and ligaments have poor blood supply and rely on nutrients diffusing in during loading. A study found that 15 g of gelatin with vitamin C taken an hour before brief, intense loading doubled a marker of collagen synthesis. The idea is to have glycine, proline, and the collagen-signaling peptides in the blood at the moment the tissue is being stressed. Six minutes of jump rope or similar jumping was enough in the study.
Does gelatin help joints?
Trials of hydrolyzed collagen (nutritionally equivalent to gelatin) at 10 g daily for 3–6 months show modest reductions in activity-related joint pain in athletes and in people with osteoarthritis. The effect is smaller than that of medication but the safety profile is excellent. It works best as part of a strategy that includes appropriate exercise.
Does gelatin from gummies and desserts count?
The gelatin is the same, but a serving of jelly dessert contains only 1–2 g of gelatin along with significant sugar, versus the 10–15 g used in studies. A home-made version using unflavored gelatin and fruit juice can deliver a meaningful dose without excess sugar.
References
- Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis. Shaw G, Lee-Barthel A, Ross ML, Wang B, Baar K. Am J Clin Nutr (2017)View study
- Oral Collagen Supplementation: A Systematic Review of Dermatological Applications. Choi FD, Sung CT, Juhasz ML, Mesinkovsk NA. J Drugs Dermatol (2019)
- Collagen hydrolysate for the treatment of osteoarthritis and other joint disorders: a review of the literature. Bello AE, Oesser S. Curr Med Res Opin (2006)
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This entry is for educational purposes only. It is not medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen, especially if you take medications or have health conditions.