If you have the MTHFR polymorphism, you could benefit from the active form of folate (5-MTHF or methylfolate), which may be more bioavailable
Don't know what your GP was thinking of...might be worth re-visiting...see if you can get the 5mg dose u till your levels are raised sufficiently Presume you mean 400mcg and 800mcg rather than mg, in your reply
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This is why it is very important to get tested and get your Vitamin B12 levels optimized
Find out how and when to take it so your body gets the most from it
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