are b12 injections in abdomen Optimal Injection Sites for Maximum Absorption and Benefits How to Give a B12
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They address different problems and are sometimes used together in the same patient
About AHK-Cu

Because hGH is a complex, multifaceted hormone

For injections used in diagnosed deficiency, UK clinical guidance prefers hydroxocobalamin because it persists longer in the body, while oral replacement tablets are typically cyanocobalamin ( NHS treatment guidance )
