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Subcutaneous injections can be administered at the side or back of the upper arm, lower abdomen, and front of the thigh

Spirulina is not a good source of B12 and only contains B12 analogues Because vitamin B12 is water-soluble it's extremely hard to overdose, and because the body is quite inefficient at absorbing B12, supplements often contain 10,000% RDA, sometimes even 100,000% RDA, to try and ensure the body actually absorbs some of it

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Without enough B12, there can be some damages in nerve function, which can lead to symptoms such as tingling and numbness

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On top of that, people who drink frequently often eat less balanced diets, which compounds the shortfall