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ghk-cu safe dosage subcutaneous injection Injectable GHK-Cu: Beginner's Guide to Copper Peptide How long does 100mg of
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Must be an established patient with a Physician's Plan

Gastric or bariatric surgery : Patients who have undergone weight loss surgeries such as gastric or bariatric surgery may experience B12 deficiency due to the unavailability of intrinsic factor after gastric or intestinal resection

Since you are already looking at the injectable side, here is the honest comparison for skin specifically

Vitamin B12 shots can give you more energy and help you avoid feeling tired
