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One is studied for pigmentation, the other for a central brain pathway
Each method has its own advantages and disadvantages, making it essential to choose the right one based on individual needs and health status
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This study below, published in 1967 carried out trials to determine how long cyanocobalamin and hydroxocobalamin B12 injections lasted before excretion in urine but you can see from their summary that it would be unreliable to assume that one size fits all
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