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These systemic reactions are also typically short-lived
In fact, its been found that B12 supplements taken orally are just as effective as intramuscular shots in overcoming states of deficiency when you take up to 1,000 micrograms a day
When demand surges faster than supply, compounding pharmacies often step inbut with complex biologic molecules, even small formulation changes can carry significant scientific and safety implications
If you can absorb B-12 and have simply developed a deficiency you will only need enough to build up your reserves
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