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Stainless steel needles are commonly preferred for B12 injections
Short-term temperature fluctuations during shipping do not affect product integrity
Cyanocobalamin vitamin B12 used for vitamin B12 deficiency
For hair specifically, the Pyo 2007 study (PMID 17703734) described a more defined mechanism: in cultured human dermal papilla cells, AHK-Cu increased proliferation, raised vascular endothelial growth factor (VEGF), lowered transforming growth factor-beta1 (TGF-beta1), and shifted apoptosis markers toward cell survival
It is injected once weekly, and the timing relative to meals does not significantly impact its effectiveness
Any temperature excursion above 10C for more than 2 hours compromises peptide stability
