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Blood tests may be conducted to measure your Vitamin B12 levels

They also play an important role in the production of brain messengers known as neurotransmitters

MRP7 MRP7 is a lipophilic anion transporter found primarily in the heart, liver, skeletal muscle, and kidney

The copper content of GHK-Cu formulations has been a theoretical safety consideration, given that excessive copper can be toxic - however, the amounts used in cosmetic and research applications are extremely small, the copper is tightly chelated by the peptide (reducing free copper availability), and topical absorption of copper from these products appears minimal and well below levels that would cause systemic copper accumulation or toxicity