What vitamins are vegans missing out on?

So what vitamins do vegans need to be mindful of.  No, I am not a doctor, but I am researching what I hope to be reasonable resources with a view to answering questions such as this.

The only vitamin that I see coming up time and time again as being an issue for anyone living on a purely plant based diet, i.e. vegans is vitamin B12. Apparently if you do not get adequate B12, it can cause anaemia or nervous system damage. It can lead to fatigue, memory loss, and muscle weakness amongst other symptoms.

According to veganhealth.org, most vegans consume enough B12 to avoid anaemia and nervous system damage, but many do not get enough to minimize potential risk of heart disease or pregnancy complications.

They go on to say that to get the full benefit of a vegan diet, vegans should do one of the following:

1. Eat fortified foods two or three times a day to get at least three micrograms (mcg or µg) of B12 a day or
2. Take one B12 supplement daily providing at least 10 micrograms or
3. Take a weekly B12 supplement providing at least 2000 micrograms.

According to the Global Healing Centre website Methylcobalamin is the most bioavailable form, as this form requires little to no conversion and crosses easily through every aspect of B-12’s metabolic pathway. Apparently it is better than the cheaper and common version of B12, Cyanocobalamin. Always read the label, and follow the advice of you medical practitioner etc, etc.