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Plasma GHK-Cu levels start dropping measurably around age 25, the same age you begin losing roughly 1% of your collagen per year

B12 Injections can help improve memory, focus, energy, emotional stability, female fertility, low testosterone for men, digestive issues, hypothyroidism, red blood cell formation, metabolism, and its also helpful for nerve and brain regeneration

Nat Clin Pract Endocrinol Metab (2006) 2:57181

doi: 10.2337/diabetes.54.3.679
