“Collagen is only really found in the bones, tendons, connective tissues and organs of animals,” explains Anna Lahey, founder of Vida Glow.Vida Glow Natural Marine Collagen, £39 for 30 servings here The marine collagen in these mix-into-drinks powders is sourced from the discarded skins of responsibly farmed fish.(Image: Absolute Collagen / Vida Glow) The Jojoba Company Ultimate Serum, £48 here Containing an innovative new ingredient called HumaColl21, a human-identical collagen derived from...