How to Choose a Collagen Supplement
Collagen is popular for skin and joint support, but the research is still developing. Here is how to shop sensibly.
Last reviewed: October 2026 · How we research
Disclosure: As an Amazon Associate I earn from qualifying purchases. This guide is general information, not medical advice. Talk to your doctor before starting any supplement.
Keep expectations realistic
Studies on collagen supplements for skin and joints have shown mixed or modest results, and research is ongoing. Think of it as an optional extra, not a guaranteed fix.
Types and sources
- Hydrolyzed collagen (collagen peptides): Broken into smaller pieces, so it dissolves easily in hot or cold drinks.
- Gelatin: Similar source, but it gels as it cools. Useful in cooking.
- Bovine versus marine: Bovine collagen comes from cattle, marine from fish. Marine is not suitable if you have a fish allergy.
- Types I, II and III: Different types of collagen are marketed for different purposes, such as skin or joints. Check which type a product contains.
Read the label
- Collagen per serving and the scoop size.
- Added ingredients. Vitamin C is common and harmless. Watch for added sugar, especially in gummies and flavored powders.
- Testing. Look for third-party testing for contaminants such as heavy metals.
- Marketing claims. Terms like "grass-fed" are hard to verify without certification.
Good to know
- Collagen is not a complete protein, so it should not replace other protein sources.
- Collagen comes from animals. "Vegan collagen" products contain nutrients meant to support your body's own production, and do not contain collagen itself.
- If you have allergies or take medications, check with your doctor first.
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