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The product is available through prohealth.com and authorized third-party retailers including iHerb and Target
Plant Physiol 117:11031114 Vauclare P, Kopriva S, Fell D, Sutter M, Sticher L, von Ballmoos P, Krhenbhl U, Op den Camp R, Brunold C (2002) Flux control of sulphate assimilation in Arabidopsis thaliana: adenosine 5-phosphosulphate reductase is more susceptible that ATP sulphurylase to negative control by thiols
Zhang J, An H, Ni K, Chen B, Li H, Li Y, et al
For someone asking me right now what to do about a chronic tendon injury, I'd recommend PRP before peptides -- not because peptides are worthless, but because the evidence hierarchy matters