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Research has shown that long-term use of certain drugs can interfere with absorption pathways
These peptides are also on the World Anti-Doping Agency (WADA) Prohibited List, making Amazon and other peptide retailers like Alibaba some of the largest retailers of illegal performance enhancing drugs in the world
Certain factors may theoretically affect B12 absorption
Used for type 2 diabetes, this is known to block B12 absorption and the MHRA (Medicines and Healthcare Products Regulatory Agency) suggests that the B12 levels of metformin users should be monitored if they develop deficiency symptoms
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