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In mild cases, low levels of vitamin B12 can cause fatigue and anemia, while more serious deficiencies can lead to serious neurological and heart impairments

10.1038/s41568-018-0002-y Nat

Potential concerns with low-quality peptides may include: Incorrect dosing Degraded peptide structure Poor sterility practices Improper shipping or storage Unknown fillers or contaminants Lack of independent testing In some cases, products marketed online may contain significantly less peptide than advertised or none at all

start low (50 mg) and increase by ~25 mg weekly as tolerated

available without a prescription in Canada, with a prescription required in Quebec