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Description
The formulation and excipients in B12 supplements often play a significant role

Low concentration: 0.1% to 0.5% Entry-level copper peptide products typically contain 0.1% to 0.5% GHK-Cu
Elevated exposure to polycyclic aromatic hydrocarbons (PAHs) may trigger cancers in Pakistan: an environmental, occupational, and genetic perspective

Lancet 346 , 1231 (1995)
