Collagen
May ease joint pain during activity, but the evidence is still thin
What it is
An animal-derived protein. Supplements contain collagen hydrolysate (peptides) or gelatin. People take it for joints, ligaments and tendons.
Benefits
Data are limited. The IOC says increased collagen production and less pain seem possible, while functional benefits and effects on recovery from injury are not known. A 2021 systematic review found strong evidence that 5–15 g a day improves joint pain and function. AIS: it may be beneficial, but more research is required.
Dose
The sources disagree. IOC: 5–15 g of gelatin with 50 mg of vitamin C, or about 10 g of collagen hydrolysate a day. Systematic review: 5–15 g a day, with 15 g raising collagen synthesis more than 5 g. AIS: 20–30 g a day.
When to take it
40–60 minutes before training, or 1 hour before a rehabilitation session; on a non-training day, at the same time of day (AIS). The systematic review links the benefit to taking it at least 1 hour before exercise for more than 3 months.
Who it's for
People with activity-related joint pain, those rehabilitating a tendon or ligament, or with a previous connective tissue injury, as part of an overall plan alongside well-established methods (AIS). Your diet must supply enough vitamin C: it is needed for collagen synthesis.
Who can skip it
People looking for muscle growth: collagen had no significant impact on muscle protein synthesis compared with higher-quality protein. It may not suit vegetarians and vegans, as it is animal-derived (AIS).
Forms
The main supplemental form is hydrolysed collagen (peptides): collagen is broken down by enzymes into short peptides that are easily absorbed. Unlike gelatine, the peptides do not gel and dissolve in cold water. The raw material is bovine, porcine, marine or poultry (a 2021 review). A separate form is undenatured type II collagen from chicken sternum: in the single study described in the review, at 40 mg a day knee extension range and pain-free exercise time improved relative to baseline.
Safety
The IOC rates gelatin and collagen as low risk. In the systematic review no study reported adverse effects, even at 60 g a day. If the product contains vitamin C: chronic vitamin C supplementation may impair adaptation to training (AIS). The sources say nothing on an upper level or on interactions with medicines.
From regular food
This is a summary of public sources, not medical advice. If you have a health condition, are pregnant or take medication, talk to a doctor before taking a supplement.
Sources
- IOC consensus statement: dietary supplements and the high-performance athlete . International Olympic Committee / British Journal of Sports Medicine, 2018.
- AIS Sports Supplement Framework — Group B . Australian Institute of Sport, 2026.
- The effects of collagen peptide supplementation on body composition, collagen synthesis, and recovery from joint injury and exercise: a systematic review . Amino Acids, 2021.
Other supplements
A week of training and meals built for you
Workoutify plans workouts around your days, time and equipment — and a menu for your goal and macros.