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If needles aren't your thing, B12 supplements are also available in capsule, tablet, and liquid forms, which can often be purchased over-the-counter (via Medical News Today)

Some studies didnt report on all of the parameters and dont appear in every chart

Protection and polyfunctional T cells induced by Ag85B-TB10

The four forms (vitamins) of B12 are all deeply red colored crystals and water solutions, due to the color of the cobalt-corrin complex (biologically relevant enzyme, it is the "core" of vitamin B12)

Are vitamin B-12 injections helpful for weight loss

The body doesnt produce B12 on its own, so it must be obtained through diet or supplements