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The combination has not been studied across extended timeframes in humans
Is It Better To Take B12 In The Morning or at Night
The only way to really know if you've taken too much vitamin B12 Apparently, there are, in fact, some things that can go wrong if you take too much vitamin B12, from a minor headache to a severe allergic reaction, depending on your own personal risk profile
Combining them might to offer the benefits of both without significantly increasing the risk of adverse effects
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