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While MIC b12 dosages are safe for short-term use, there have been some reports of side effects when used over a long period

The length you choose is determined entirely by the type of injection you need to perform

Analysis of micrornas and their precursors in bovine early embryonic development

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

doi: 10.1038/s41573-019-0035-2

Researchers and biohackers alike have explored its application for accelerating the healing of soft tissues including tendons, ligaments, muscles, skin, blood vessels, and even nerves