I have a problem with vit B12....I drink soya milk which is fortified and also eat a fortified cereal. I'm worried if it's enough as I have a MAJOR problem with supplements. Even if I take a low dose vitB12 tablet or a combined tablet...I can't sleep! I sleep but wake up about every 20 mins cthroughout the night!!! Is t asking a supplement once a week enough...maybe on a Friday when I'm going out and wanna be awake till late???