Vegan collagen alternatives lack true collagen structure – plant-based products typically contain collagen-precursor amino acids (proline, glycine, lysine) rather than actual collagen, which is animal-derived; bioavailability and clinical equivalence remain unproven compared to animal or recombinant sources
Evidence base for supplementation is limited – most collagen supplement claims lack robust clinical trial data; any benefits for skin, joints, or connective tissue should be considered alongside conventional therapies with established evidence
Patient counselling should distinguish marketing from evidence – clinicians should advise patients that "vegan collagen" marketing terminology may be misleading, and that nutritional adequacy of amino acids through diet or proven supplements may be more reliable than unregulated collagen products
Source Standfirst
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