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In UK, NHS tends to use hydroxycobalamin and I think doctors in US often use cyanocobalamin
However, while you can get them through natural sources, some people are still not getting enough vitamin B12 daily (like vegetarians or vegans)
The NHS schedule for treating B12 deficiency is a loading dose of 1mg hydroxocobalamin by intramuscular injection every two to three days for two weeks, then a maintenance dose every two to three months for life when the cause is non-dietary
Its copper also supports lysyl oxidase, the enzyme that cross-links new collagen fibers and gives the matrix strength (gene regulation, tissue clearing, and collagen cross-linking)
Otherwise, you may have to continue with injections
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