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Everything they say it is

Nobody is having an honest conversation about this topic, so allow me to be the icebreaker here

Molecular Metabolism, 30, 72-130

There are several types of collagen, but for those of us focused on an active lifestyle and healthy aging, Type I and Type III are the most critical

A "foundational challenge" was simply defining the substances, because the chemical composition for peptides labeled with the same name varied considerably, explained FDA official Russell Wesdyk

Its most cited wound-healing paper, Malinda et al., J Invest Dermatol 1999, showed that T4 increased re-epithelialisation by roughly 42% at four days and up to 61% at seven days in a full-thickness rat wound model, with greater collagen deposition and angiogenesis