How to Take Collagen: Dosage, Timing and Duration
Collagen peptides have moved from beauty aisles into the kit bags of runners, footballers and lifters. Unlike many trendy supplements, collagen does have a growing body of research behind it — but the details of how much, when and for how long matter. Our editorial team summarises what the studies used and how that translates into everyday practice.
What collagen supplements are
Collagen is the most abundant protein in the body, forming the structural framework of tendons, ligaments, cartilage, bone and skin. Supplements are typically made from bovine hide, pig skin or fish skin and scales, processed into gelatin or broken down further into hydrolysed collagen peptides.
Hydrolysed collagen dissolves easily in cold or hot liquids, which is why it is the most common form in powders and ready-to-drink products. Gelatin requires heat to dissolve and sets when cooled, but provides a very similar amino acid profile.
Collagen is rich in glycine, proline and hydroxyproline, but low in leucine and lacks tryptophan entirely. It is therefore an incomplete protein and a poor choice for building muscle compared with whey, milk or meat.
The rationale for supplementation is different: certain collagen-derived peptides and amino acids appear in the blood after ingestion and may act as both building blocks and signals for cells that produce connective tissue.
Daily amounts used in research
Studies have used a range of amounts depending on the goal. The figures below summarise the typical intakes tested, not personalised prescriptions.
| Goal | Typical amount in studies | Example research |
|---|---|---|
| Activity-related joint pain | ~10 g per day | Clark et al., 2008 (24 weeks in athletes) |
| Tendon support with exercise | ~5–15 g per day | Praet et al., 2019 (Achilles tendinopathy) |
| Collagen synthesis around exercise | ~15 g gelatin + vitamin C | Shaw et al., 2017 |
| Skin hydration and elasticity | ~2.5–10 g per day | Pooled in de Miranda et al., 2021 |
| Muscle with resistance training in older men | ~15 g per day | Zdzieblik et al., 2015 |
For most active adults interested in joints and tendons, 10–15 g per day sits in the middle of the studied range. Lower amounts are generally used for skin-focused products.
The study by Shaw and colleagues (2017) is often quoted: 15 g of vitamin C-enriched gelatin taken an hour before short bouts of rope-skipping doubled a blood marker of collagen synthesis compared with placebo. It is a promising mechanistic finding, not yet proof of fewer injuries.
Because collagen counts towards daily protein intake but is an incomplete protein, it should be considered an addition to — not a replacement for — high-quality protein sources.
Timing: does it matter?
For general use, such as skin or joint comfort, timing appears to be of little importance. Most studies simply had participants take collagen once a day with a drink or meal.
For tendons and ligaments, there is a more specific hypothesis. Connective tissue receives relatively little blood flow, and loading it with exercise may help draw amino acids into the tissue. Taking collagen 30–60 minutes before training, so that blood levels of key amino acids peak during the session, is therefore suggested.
Adding around 50 mg of vitamin C — the amount in a small glass of orange juice or a tablet — is common practice, because vitamin C is a cofactor for enzymes that stabilise collagen fibres.
The short, targeted loading sessions used in research were followed by several hours of rest. Some practitioners therefore recommend taking collagen before rehabilitation or "tendon-specific" exercises rather than before every training session.
How long to take collagen
Connective tissue renews slowly, so collagen is not a supplement for quick results. Most positive trials lasted 8 to 24 weeks.
- Skin: changes, if any, are usually reported after 8–12 weeks.
- Joint comfort: studies in athletes typically ran 12–24 weeks.
- Tendon rehabilitation: often combined with a structured programme over 3–6 months.
- Reassess: if there is no noticeable benefit after three months, continuing indefinitely is hard to justify.
There is no evidence that "cycling" collagen is necessary. It is a food-derived protein and can be used continuously if it seems helpful.
Collagen will not compensate for poor load management. Persistent tendon or joint pain should be assessed by a GP, physiotherapist or sports medicine doctor, since the right exercise programme is the main treatment.
Choosing a product and safety
Collagen is generally well tolerated. The most common complaints are a feeling of fullness, mild digestive upset or an unpleasant taste in unflavoured versions.
Allergy to fish or shellfish is relevant for marine collagen, and people avoiding beef or pork for religious, ethical or dietary reasons should check the source. There is no true vegan collagen; "vegan collagen boosters" contain amino acids and vitamins rather than collagen itself.
People with a history of kidney stones may wish to discuss high intakes with a doctor, since hydroxyproline is metabolised to oxalate. Those with phenylketonuria should check for added sweeteners such as aspartame.
For tested athletes, choose products certified by a batch-testing scheme. In the UK, collagen supplements are foods, and there are no authorised health claims specific to collagen, so bold promises on packaging should be treated with scepticism.
Conclusions of the editorial team
Collagen is one of the better-researched connective tissue supplements, with studied intakes typically between 5 and 15 g per day, taken for at least two to three months.
For tendons and ligaments, taking it 30–60 minutes before targeted exercise, with a little vitamin C, is a sensible and evidence-informed approach.
It complements, but cannot replace, complete protein sources, good load management and professional assessment of injuries.
See also our articles on hyaluronic acid for athletes, on vitamin C and connective tissue, and on rehabilitating Achilles tendon problems.
References
- Shaw G, Lee-Barthel A, Ross ML, Wang B, Baar K. Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis. Am J Clin Nutr. 2017;105(1):136–143.
- Clark KL, Sebastianelli W, Flechsenhar KR, et al. 24-Week study on the use of collagen hydrolysate as a dietary supplement in athletes with activity-related joint pain. Curr Med Res Opin. 2008;24(5):1485–1496.
- Praet SFE, Purdam CR, Welvaert M, et al. Oral supplementation of specific collagen peptides combined with calf-strengthening exercises enhances function and reduces pain in Achilles tendinopathy patients. Nutrients. 2019;11(1):76.
- Zdzieblik D, Oesser S, Baumstark MW, Gollhofer A, König D. Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomised controlled trial. Br J Nutr. 2015;114(8):1237–1245.
- de Miranda RB, Weimer P, Rossi RC. Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis. Int J Dermatol. 2021;60(12):1449–1461.
