Supplement analysis backed by scientific evidence · PT

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Moderate evidenceJoints & skin

Gelatin

Gelatin is collagen peptides' cheaper, less processed sibling — the same amino acids at a fraction of the price, with the best single piece of connective-tissue evidence in the whole collagen category coming from a gelatin trial, not a branded peptide.

What the science says

  • Boosts collagen synthesis when taken with vitamin C before loading Moderate evidence

    In a crossover trial, 15 g of gelatin with 48 mg vitamin C taken one hour before 6 minutes of rope skipping roughly doubled the blood marker of collagen synthesis (PINP) versus placebo, with 5 g giving a smaller effect. In the same study, serum from supplemented subjects increased collagen content and mechanical strength of engineered ligaments. This is a mechanistic and biomarker result, not a proven injury-rate reduction.

  • Improves tendon and joint outcomes in training Limited evidence

    A 2024 meta-analysis of collagen peptide supplementation alongside long-term training found small effects on body composition and inconsistent effects on strength and tendon remodeling across studies. Gelatin is chemically the same substrate, so it inherits the same uncertainty: plausible, biomarker-supported, not yet demonstrated on hard clinical endpoints.

  • Gelatin is inferior to hydrolyzed collagen peptides Limited evidence

    Hydrolyzed peptides dissolve in cold liquid and are absorbed slightly faster, but both deliver the same glycine/proline/hydroxyproline profile and both raise plasma hydroxyproline-containing peptides. No trial has shown peptides outperform gelatin on any outcome — and the landmark collagen-synthesis study used plain gelatin. The practical difference is convenience, not efficacy, at typically 2-4x the price per gram.

Dosage & safety

Studied dose15 g gelatin plus ~50 mg vitamin C, taken 30-60 minutes before loading exercise, is the protocol with the strongest supporting data; 5-10 g produces a smaller biomarker response. Must be dissolved in hot liquid (~60-80 C) or bloomed in cold water first, or it clumps. Unflavored powdered gelatin costs a fraction of branded peptides.
SafetyVery safe; the main complaints are GI heaviness and the practical annoyance that it gels when it cools. Not a complete protein — gelatin contains no tryptophan and is low in essential amino acids, so it should be counted as a supplement, not toward your protein target. Made from bovine or porcine hide and bone, so it is not vegetarian, kosher or halal unless specifically certified. Theoretical BSE concerns led to sourcing controls decades ago; commercial gelatin from regulated supply chains is considered safe. No sport-banned substances.

Scientific references

Where to buy

Micro Ingredients, Beef Gelatin Powder, Unflavored, 2 lb (907 g)

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