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Yet, B12 deficiency is clearly a problem: In the United States, it is estimated that roughly 6 percent of people under age 60 (8) are short on the micronutrient

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Using a properly dosed, well-formulated GHK-Cu product consistently is what allows the cumulative effect to occur.

B12 injections are also available through online providers like AgelessRx, which connects users with licensed medical prescribers. After a virtual visit, these services may send prefilled syringes or vials with instructions, often using the active form methylcobalamin, which is considered highly bioavailable. Some mobile health services send registered nurses to homes or offices to administer B12 injections, combining medical oversight with convenience for busy individuals

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"I don't see why one would take the path of a proper drug approval if there is now this less rigorous, alternative path to market," he said