Can I use collagen as my only protein powder?

No. Collagen is not a 'complete' protein because it lacks tryptophan, one of the essential amino acids. While it is excellent for skin and joints, it should be used as a supplement to—not a replacement for—complete proteins like whey, meat, or plant-based blends that support muscle protein synthesis.

About Whole Body Collagen Benefits: A Guide for Protein and Skin Health

This answer is drawn from the full physician-reviewed guide to Whole Body Collagen Benefits: A Guide for Protein and Skin Health on the GOAL.MD Vitamin Shop learning hub. Read the full guide for mechanism of action, evidence, dosing, safety, and interactions.

Medically reviewed by Dr. Michael Mimlitz, MD (NPI 1508891870), Chief Physician of GOAL.MD. Physician-supervised telehealth. More at goal.md/answers.