I read that spirulina has B12. I put it in smoothies.

Bottom line, even if there are small amounts of B12 in plant matter, humans (not having the digestive systems of cows and other herbivores) cannot absorb it. Alas, we are not true herbivores - which can already be seen by the fact that, unlike cows, we cannot digest cellulose and get nutrition from, say, grass. I understand that some people choose to live without any animal products, but they still need to accept the limitations of the human digestive system or risk severe nutritional deficiencies.

So, if you're a strict vegan, please take a B-12 supplement. I understand about not wanting to get anything made from meat or dairy or eggs, but there are supplements made from bacteria or yeasts; hopefully those are more ethically acceptable. Such supplements are also better than unenriched brewer's yeast or miso or tempeh or other foods that *can* contain B12 (due to contained yeasts or fungi), because in those foods B12 *can* occur, but it doesn't always and amounts can vary a lot. A supplement, or B12-enriched foods, are safer because someone actually makes *sure* there's B12 on board. (I drink a B12-enriched vanilla soy milk that is very yummy!)

Also, for the original poster, I second the recommendations to get some bloodwork done to see what you're really lacking. You may have an iron deficiency, or lack other B vitamins, or such. Better to be sure!