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Pharmaceutical-grade peptides from reputable suppliers undergo testing for purity, sterility, and accurate concentration

Despite the lack of rigorous clinical studies, case studies and independent experimental use have consistently yielded good results with few reports of adverse effects

FDA PCAC 2023 What this means practically for research dosage decisions: Doses above 1 mg/day are not supported by efficacy data and appear to produce diminishing returns

The interesting thing is that our body can store vitamin B12 in the liver for a long time, so it might take a few years before you start to have a shortage of it in your body