Does collagen help joint pain and tendons?

What does the evidence actually show?

The Australian Institute of Sport places collagen in Group B: promising, but not yet proven. The strongest tendon-related finding is a small crossover study by Shaw and colleagues (2017) in eight men. Taking 15 g of gelatine with about 48 mg of vitamin C one hour before six minutes of skipping roughly doubled a blood marker of collagen synthesis (PINP) compared with placebo. A 5 g dose added little. A follow-up by Lis and Baar (2019) in ten people saw a smaller trend that did not reach statistical significance.

For joint discomfort, a 24-week randomised, placebo-controlled trial in 147 athletes with activity-related joint pain (Clark and colleagues, 2008) used 10 g a day of collagen hydrolysate and reported less pain than placebo, most clearly at the knee. It is a single trial and it has not been widely replicated.

Why does the timing around exercise matter?

Blood levels of glycine, proline and hydroxyproline peak about an hour after a dose. Tendon cells respond to mechanical loading, so the idea is to have those building blocks circulating while the tendon is being loaded. That is a hypothesis supported by one small study, not an established protocol.

A practical protocol (if you want to try it)

• Dose: 10 to 15 g of hydrolysed collagen.
• Vitamin C: about 50 mg, which a naartjie or a few slices of red pepper provides.
• Timing: 30 to 60 minutes before a short bout of loading, such as skipping, plyometrics, hill repeats or physio-prescribed rehab.
• Duration: give it at least 12 weeks and keep the loading programme going. Collagen without loading has no logic behind it.

What does it cost in South Africa?

As of October 2026, ATP Fitness Hydrolysed Collagen in the 910 g tub costs R950 on the brand's shop, which is R10.44 per 10 g scoop (about R15.66 for a 15 g dose). Alternatives include The Harvest Table Bovine Collagen 800 g refill at R909 (R11.36 per 10 g, Faithful to Nature) and Sport Rx Collagen Rx 600 g at about R688 to R695 (R11.47 per 10 g). A trade-off for ATP: the 910 g tub is a large upfront spend, and a third-party sport certification is not published. See the cheapest collagen per 10 g for the full table and our collagen comparison.

What collagen will not do

It will not rebuild damaged cartilage or replace rehabilitation. Collagen is also an incomplete protein, so it does not replace whey for muscle (see why). If you are a runner, collagen for runners covers how it fits into a training week, and how much collagen per day lists the dose used for each goal.

When to see a doctor

Persistent joint pain, swelling, night pain, or a tendon that has been sore for more than a few weeks should be assessed by a doctor or physiotherapist before you reach for a supplement. Marine collagen is unsuitable if you have a fish allergy, and anyone who is pregnant, breastfeeding or on medication should check with a doctor first.

Under-18s should get protein from food rather than collagen powders. Check with a doctor if you have kidney disease or take regular medication.

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