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Traditional oral pills often achieve less than 20% absorption

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

Typical sizes include 50mg and 100mg vials

Ill be sharing more information about significant drug interactions with thyroid hormones in the future, but for now, I recommend checking with your pharmacist whenever you start a new medication, to see if your dose of thyroid medication needs to be adjusted

Your BHRC provider will review all options during your consultation