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Cyanocobalamin is a synthetic form of vitamin B12 found only in supplements, while Methylcobalamin is a naturally occurring form that you can get through either food sources or supplements

Keep in mind that the clinical manifestations of vitamin B12 deficiency differ depending on the degree and duration of deficiency, but some of the most common symptoms of a B12 deficiency include 4 : Anemia Chronic fatigue Shortness of breath Heart palpitations Pallor Skin hyperpigmentation Glossitis Infertility Osteoporosis Sensory loss Abnormal balance or reflexes Cognitive impairment Memory loss Older adults are at a higher risk for vitamin B12 deficiency, as are those on a vegetarian or vegan diet, as dietary B12 is found in animal products

Use an insulin syringe (typically 0.5 mL or 1 mL capacity with a 29-31 gauge needle)

Pregnant or breastfeeding individuals should avoid GHK-Cu unless a healthcare provider determines the benefits outweigh potential risks