We may earn a commission through disclosed purchase links, at no extra cost to you. Rankings are sorted by arithmetic, never by commission. This is a label comparison, not hands-on testing or medical advice.
Short answer
Published trials used about 2.5 g to 15 g of collagen a day. The smaller amounts (2.5–5 g) were mostly used in skin studies, 10 g in a joint-pain study in athletes, and 15 g alongside resistance training in older men. These are amounts studied, not a recommendation for you.
Amounts used in published trials
| Study | Daily amount | Participants | Duration | Measured |
|---|---|---|---|---|
| Skin Pharmacology and Physiology, 2014 | 2.5 g or 5 g a day | 69 women aged 35–55 | 8 weeks | skin elasticity (both amounts improved vs. placebo) |
| Skin Pharmacology and Physiology, 2014 | 2.5 g a day | 114 women aged 45–65 | 8 weeks | eye wrinkle volume and skin procollagen |
| Skin Pharmacology and Physiology, 2021 | 1 g or 5 g a day | 99 women aged 35–50 | 12 weeks | skin hydration |
| Nutrients, 2018 | 5 g a day | 131 postmenopausal women with reduced bone density | 12 months | bone mineral density |
| Current Medical Research and Opinion, 2008 | 10 g a day | 147 college athletes with activity-related joint pain | 24 weeks | activity-related joint pain |
| British Journal of Nutrition, 2015 | 15 g a day | 53 men around age 72 with sarcopenia, plus resistance training | 12 weeks | fat-free mass and strength |
Each trial tested a specific collagen preparation, not the products on this page. Links open the PubMed record.
A 2019 systematic review of 11 randomized dermatology trials found collagen hydrolysate doses of 2.5 g to 10 g a day, taken for 8 to 24 weeks, with no reported adverse events.
How products compare to trial amounts
Of the 26 products in our collection that state collagen grams per serving, 20 provide at least 2.5 g, 19 at least 5 g and 12 at least 10 g per labeled serving.
Capsules are where this matters most. See capsules per serving.
Practical points
- Use collagen grams per serving from the label; scoop weight includes flavoring and other ingredients.
- Most skin trials ran 8 to 12 weeks.
- Collagen counts toward protein intake but lacks the amino acid tryptophan, so it is not a complete protein.
- If you have kidney disease, are pregnant or take medication, ask a health professional before adding a supplement.
Work out what a daily amount costs →
Questions
How much collagen should I take a day?
Trials used roughly 2.5 g to 15 g a day depending on the outcome. Follow your product label, and ask a health professional about your situation.
Is 10 g of collagen a day too much?
10 g a day was used for 24 weeks in a trial of athletes, and a 2019 review reported no adverse events across its trials. That is not a guarantee for everyone; check with a professional if you have health conditions.
How long does collagen take to work?
The skin trials we cite measured results after 8 to 12 weeks; the bone density trial ran 12 months.
Sources and method
- Skin Pharmacology and Physiology, 2014 (PMID 23949208)
- Skin Pharmacology and Physiology, 2014 (PMID 24401291)
- Skin Pharmacology and Physiology, 2021 (PMID 33774639)
- Nutrients, 2018 (PMID 29337906)
- Current Medical Research and Opinion, 2008 (PMID 18416885)
- British Journal of Nutrition, 2015 (PMID 26353786)
- Systematic review of oral collagen in dermatology, 2019 (PMID 30681787)
Label figures and prices are from each manufacturer’s product page, checked November 3, 2026. We have not tested these products. For personal suitability, especially if you take medication, are pregnant or have a fish or egg allergy, consult a qualified health professional.