You should supplement with Vitamin B12 methylcobalamin (Its important it's methyl). You can buy sublingual which means it goes into your bloodstream. Excess is excreted in urine. Vitamin D should be D3 and not D2.
Both these can be bought, if you wish, through Amazon and the link is on the right-hand column.
I buy the little DLUX sprays you get in Holland & Barrett, tells you on the side that they are D3, I get my Jarrow's Methylcobalamin from Amazon - it comes from the US but doesn't take long.
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