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I paid $40 for a 5 milligram vial, enough for about 10 bi- or triweekly injections

The biphasic response suggests possible mechanisms: lower doses (nanogram range) might work through growth factor upregulation and signaling cascade amplification, while higher doses (microgram range) might involve direct receptor activation or substrate provision for cellular repair

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Pay attention to the ingredients: Choose products with as few additives as possible, such as sugar, artificial flavors, or unnecessary fillers

Even if your diet includes B12-rich foods, your body might not be absorbing or utilizing the vitamin as well as it should