If you're taking B complex you don't need more B 12. B 12 does absorb through stomach proteins and is available also in meat, dairy, fish, and eggs. Sublingual still has you swallowing much of the vitamin, which is then absorbed through the intestines with the stomachs help. Light yellow, or what some call fluorescent yellow, means B vitamins. I had that a lot when I used to take extra B vitamins, before I stopped, knowing if you eat a varied diet you'll get enough B. Dark urine is usually from dehydration or certain foods.
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