How much collagen per day, by the evidence

What people ask us next.

Q01

How much collagen should I take per day?

Match the dose to the goal. For skin (elasticity and hydration), positive trials used 2.5-10 g/day of hydrolyzed collagen peptides for 8-12 weeks (Pu et al. 2021, n=1,125). For joints and tendons, studied doses run ~10-40 g/day depending on preparation. A sensible all-purpose dose is 10 g/day. Effects are modest and fade if you stop, so treat it as a daily maintenance dose, not a short course.

Q02

Is 10 grams of collagen a day enough?

Yes, 10 g/day is a reasonable all-purpose dose. It sits at the top of the skin-trial range (2.5-10 g/day) and the bottom of the joint range (~10 g/day and up). Most commercial scoops are sized at 10-20 g for this reason. Going above ~15-20 g/day adds cost without clear added benefit, since the evidence does not show a clean reward for megadosing.

Q03

Does collagen count toward my daily protein intake?

No. Collagen is ~90% protein by weight but is an incomplete, low-DIAAS protein with no tryptophan and little leucine, so it does almost nothing for muscle protein synthesis. Counting a 10 g collagen scoop as 9 g of protein effectively shorts your real intake. Keep collagen separate and hit your protein target from complete sources; see our protein-per-day guidance.

Q04

When is the best time to take collagen?

For skin, timing barely matters: outcomes track total daily intake over 8-12 weeks, not the time of day, so take it whenever you will be consistent. The one timing signal is for tendon work, where ~15 g with ~50 mg vitamin C about an hour before loading exercise was the studied protocol (Shaw et al. 2017), because collagen synthesis peaks around the loading window.

Q05

How long until collagen works, and does it last?

Skin trials ran 8-12 weeks before measuring improvements in hydration and elasticity, so give it at least that long before judging. The effect is maintenance-dependent: it fades after you stop, because you are supplying substrate, not changing the tissue permanently. That is why the dose is framed as a daily ongoing amount rather than a finite course.

Q06

What kind of collagen should I buy for that dose?

For skin and joints, hydrolyzed collagen peptides (Types I and III, bovine or marine) are the studied form, dosed at the grams above. Do not confuse it with undenatured type II collagen, a different ingredient dosed at ~40 mg/day for joints. Unflavored bulk bovine peptides are cheapest at ~$0.03-0.04/g; our best collagen powder ranking sorts tested products by $/g of peptides.