ghk-cu peptide injection dosage recommendations Guide: Typical Protocols, & Topical GHK-Cu Peptide Dosage – Neurogan
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[42] Low maternal vitamin B 12 , defined as serum concentration less than 148 pmol/L, increases the risk of miscarriage, preterm birth and newborn low birth weight

This is one reason why its used in a medical setting to help reduce overdose risk
10.4061/2011/603052 251 SathyaM.MoorthiP.PremkumarP.KandasamyM.JayachandranK

548 The spinal cord astrocytes isolated from SOD1G93A transgenic rats were co-cultured with motor neurons, resulting in the induction of motor neuron death

Vitamin B12 deficiency might be the reason behind your fatigue
