| Re: Whoa, this is a complicated one...
I've been a vegan for 6 years so far, and I've never experienced any metallic taste in my mouth. However, I do have memory problems (so maybe I don't remember the metallic taste haha... I'm kidding, I would probably remember), low energy levels, and other indicators of being iron deficient and not consistently getting enough macronutrients.
How do you normally get your required amounts of B12? I have an eating disorder and have my own food issues (making me not the best person to address your post), but I have a bottle of multi-vitamins (14 mcg of B12) and every once in a while, I get some B12 from fortified soy milk. For a vegan diet, you can also find small amounts in fortified cereals, tempeh, miso, and of course, B12 supplements or injections.
If you feel like you should be getting enough B12 from your current diet, you could have a condition which may prevent you from absorbing the vitamin (eg. you're missing the intrinsic factor protein that helps in B12 absorption, or high doses of vitamin C are destroying the B12).
I've read that long-term B12 deficiency may also be linked to depression and mood disorders, which makes sense since the vitamin helps with normal nervous system function. If you're concerned about your health and longevity, I would suggest getting a blood test done to see if you're lacking a particular nutrient.
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