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While supplements aren't necessary for everybody, many people derive tremendous benefit from them for things like improving sleep, for hormone support, and for focus
MMA and homocysteine are secondary markers: elevated levels suggest cellular B12 insufficiency even if serum B12 appears adequate
They help restore levels quickly and are often followed by monthly maintenance
FDA noted that reviewed CoAs from suppliers did not consistently include controls for impurities, aggregates, or bacterial endotoxins
The oral bioavailability question This is the central issue
