I wrote the following minor remark to the video producers: Excellent presentation, THANKS! One remark: Vitamin B12 deficiency does not cause “jaundice” but a slight yellowish-greenish look of the skin [face for example] This is a very powerful sign! [I don’t know how it is with Chinese patients…]

Sometimes the only chronic symptom can be a long time slight diarrhea or irritable bowel. You will find this mentioned nearly always only in the older medical text-books. Whenever in doubt about a deficiency which can mask so MANY SYMPTOMS give/take vitamin B12 before it is too late.