oral vs injected b12 Efficacy of different routes of vitamin supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis Why B12 Shots are Better
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If left untreated, the deficiency can cause severe neurologic problems and blood diseases

If vitamin C, strong AHAs/BHAs, low-pH exfoliants, and retinols are part of your regular skincare routine, I wouldn't say you're not a candidate for copper peptides rather, you need to be more strategic about timing

Inositol Inositol aids in the metabolism of fats, aids in the redistribution of body fat, and helps to lower cholesterol levels

Intrinsic factor production often decreases with aging
