The more depleted your body is, the more time and consistent supplementation it will take to feel the full effects
Many who struggle with absorption issues or maintain restrictive diets rely on B12 injections for consistent benefits
Oral: Shorter systemic half-life, longer local GI effect SubQ/IM Injection: Longer systemic presence, especially with IM use 3
Lots of good instructions
Pharmacol Rep 65(4):884890 Chang JT, Liang YJ, Hsu CY, Chen CY, Chen PJ, Yang YF et al (2017) Glucagon-like peptide receptor agonists attenuate advanced glycation end products-induced inflammation in rat mesangial cells
Hypotension (Low Blood Pressure) In rare cases, GHK-Cu may cause a slight drop in blood pressure, leading to mild dizziness or lightheadedness