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After Peptide Sciences shut down in March 2026, Pepta Labs is one of the verified vendors still operating with full third-party testing
B12 shots are given in the deltoid or gluteal muscle
It is not a steroid, not a hormone, and not a growth hormone releasing peptide
Additionally, B12 is involved in energy metabolism, aiding in the conversion of food into energy, and has implications for mood regulation through its role in neurotransmitter synthesis
The dose is often deliberately high, since most of it passes through and leaves the body
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