b12 vitamins stayhealthly

I purchased a b 12 high quality whole foods supplement. I need to get my d2 levels up so i bought d2 drops and d3 drops. I don't want my iron levels to go down. How to maintain a nutrient dense vegan diet? Any recommended foods? Supplements? Thanks

Alright. I know that B12 vitamin is only created by some bacteria found in the digestive systems of animals... I have a doubt about suplements. I saw that there are different types of suplements of those vitamins, but do they come from? Maybe I am bad informed, but aren't the animal products the...