Serotonin: According to research in laboratory animal models, Selank enhances serotonin metabolism in the brain stem 30 minutes after administration
So, while you may know how much you are taking, you ultimately dont know how much of that your body absorbs
CuHeal excludes diabetes, peripheral vascular disease, immunodeficiency, pregnancy, breastfeeding, recent immunosuppressant or cytotoxic medication use, and several wound-healing risk factors [7]
This is likely due to collagen having a VERY low leucine content & leucine is the amino acid responsible for stimulating muscle protein synthesis Perhaps collagen has benefits but I will want to see a much more fleshed out mechanism & more hard objective outcome data before I recommend it as a supplement
BPC-157's gastric origin makes this a particularly logical application
If it doesn't help, your provider can explore alternative approaches