This is common with many metabolic peptides and supplementsyour body develops tolerance, and the initial benefits diminish
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Sublingual (under-the-tongue) forms dissolve in your mouth, theoretically enhancing absorption by allowing some B12 to enter the bloodstream through mucous membranes rather than relying solely on digestive uptake
For some reason, and I can find no scientific basis for this, that recommendation was changed in 1974 to an injection every two months and then in 1984 to every three months
A GSL Switch is Unlikely in the Current Climate Despite a recent drive by the Department of Health and Social Care (DHSC) to encourage the reclassification of certain medicines (like those for pain, sleep aids, and skin conditions) to P or GSL status, a switch for injectable B12 is not on the cards