Why not just take a multivitamin?
I don't really, to be honest, know much about vitamins and how to cure a deficiency, at all... But I just recently watched a video, I think it was
this one from Unnatural Vegan, where she talks about iron deficiency and B12 absorbtion problems.
She said that once you have been diagnosed with a iron deficiency, you have to go to the doctor, who will prescribe iron pills.. you gotta drink those down with orage juice (cause C-vitamin helps with the absorbtion). And after two weeks of taking that, you can return to taking multi.
But when treating a deficiency, you gotta take something stronger than just a multi.
To me, that sounds right, but I don't really know.
She also said that returning to animal products, to treat a deficiency, can be even harmful. But, I think she also said something like absorbtion problems being an exeption, for some reason that I can't remember...
If vitamin pills and balanced vegan diet doesn't work, then I don't know what... But animal products (usually) isn't a magical cure, I think returning to animal products has more like a placebo effect, than anything else.
Or I'm wrong, I dunno.
These deficiency thingys are making me paranoid... Maybe I should get a blood work done as well, before something serious happens. My diet is far from perfect.... Also, I haven't taken a multi, because I have difficulties swallowing pills and all the vegan multi vitamins are huge.
I have B12 pills that I take regularly. Those dissolve on my tongue, so isn't a problem.
Fortified plantmilk has calcium, D and B12, so that's good. During autumn and winter I take D-vitamin that is chewable.
With omega-3's I still rely on eating some ground flaxseeds every day... But, like you said in your omega-3 thread, it would a good idea to supplement... I just haven't found omega-3 tablets that I could get down.