Vitamin C is required for collagen synthesis
Vitamin C is a cofactor for prolyl and lysyl hydroxylase, the enzymes that cross-link collagen fibers. Without adequate vitamin C the body cannot effectively incorporate collagen amino acids into new tissue.
Take 50-500mg vitamin C with collagen peptides (10-20g) for best use.
Take together
Vitamin C is required for collagen synthesis. Take 50-500mg vitamin C with collagen peptides (10-20g) for best use.
Take together
This interaction is rated “Synergy” by Formulate. Vitamin C is a cofactor for prolyl and lysyl hydroxylase, the enzymes that cross-link collagen fibers. Without adequate vitamin C the body cannot effectively incorporate collagen amino acids into new tissue.
Studies from our registry that mention collagen or vitamin c. Each links to the primary source and the other Formulate pages citing it.
Mentions collagen · 2019
Effect of collagen supplementation on osteoarthritis symptoms: a meta-analysis of randomized placebo-controlled trials
García-Coronado JM, Martínez-Olvera L, Elizondo-Omaña RE, et al. · International Orthopaedics
Meta-analysis of 5 RCTs (n=519) found collagen hydrolysate reduced WOMAC stiffness and pain scores in osteoarthritis — small but significant effect supporting its use for joint support.
Mentions collagen · 2014
Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study
Proksch E, Segger D, Degwert J, et al. · Skin Pharmacology and Physiology
8-week RCT (n=69) found 2.5–5g/day collagen hydrolysate significantly improved skin elasticity vs placebo, with effects measurable 4 weeks after treatment ended.
Mentions vitamin c · 2010
Iron bioavailability and dietary reference values
Hurrell R, Egli I · American Journal of Clinical Nutrition
Reviews enhancers (vitamin C, meat) and inhibitors (phytate, polyphenols, calcium) of non-heme iron absorption, providing the mechanistic basis for pairing iron with vitamin C and separating it from tea/coffee.
Mentions vitamin c · 2000
Prediction of dietary iron absorption: an algorithm for calculating absorption and bioavailability
Hallberg and Hulthén · American Journal of Clinical Nutrition
Foundational model for non-heme iron absorption factoring vitamin C, phytates, tannins, and calcium interactions.
Guide
Collagen Supplements 2026 — Backed by Clinical Evidence
Learn which collagen supplements actually work and why. Bioactive peptides survive digestion and signal tissue repair — here’s what 2026 clinical research supports.
Roundup
Best Vitamin C Supplements 2026: Form, Dose, and What Actually Works
Ascorbic acid, buffered, liposomal, or whole-food? Dose by goal (daily health, acute illness, iron absorption, collagen). What the Linus Pauling megadose narrative got wrong.
Roundup
Best Collagen for Joints: Type II vs Type I for Cartilage Support
Collagen supplements are marketed for joint health but type matters. Type II undenatured collagen has the strongest joint-specific evidence — here's why.
Other interactions to know
High-dose vitamin C may reduce B12 absorption
Vitamin C dramatically enhances iron absorption
Vitamin C regenerates quercetin
Check your full stack in the free interaction checker.
The free checker lets you add any combination of supplements and medications at once. The free web app goes further — every stack change surfaces interaction alerts automatically.
Medical disclaimer. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.
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