by Dr Gina Shaw, D.S., M.A., AIYS (Dip. Irid.)
The subject of Vitamin B12 is not new to most vegans, vegetarians or raw fooders. The supplement companies have many people running to their local health (drug) stores in an effort to make themselves deficiency-free, but is this a good idea? A number of issues will be raised in this article and I will attempt to piece together some information from many different and reliable (non-financially-oriented) sources.
A vitamin B12 deficiency is a serious disorder, but it is never just a B12 deficiency because vitamin and mineral deficiencies never happen in isolation. Indications of a deficiency of vitamin B12, when they do reach a stage where they have shown up, can be quite severe. Fatigue, paleness, anorexia, mental confusion, delusions, paranoia, weight loss, etc. are just some indications that a person may have a B12-deficiency. In my opinion, ME is a B12-deficiency disorder. If you do think you may have a B12-deficiency, it would be wise for you to seek the advice of a health practitioner (such as myself) who is knowledgeable about B12-deficiencies, for immediate advice. This disorder can eventually lead to death if left unchecked.
UK official recommendations have decreased in recent years, the body’s needs having been previously over-estimated. Indeed, the Department of Health recognises that some people have lower than average requirements of B12. A whole lifetime’s requirement of B12 add up to a 40 milligram speck of red crystals, about one-seventh the size of an average tablet of aspirin! Taking large doses of the vitamin by mouth is pointless because 3ug is the most that can be absorbed at any one time.
Vitamin B12 is excreted in the bile and is effectively reabsorbed. This is known as enterohepatic circulation. The amount of B12 excreted in the bile can vary from 1 to 10ug (micrograms) a day. People on diets low in B12, including vegans and some vegetarians, may be obtaining more B12 from reabsorption than from dietary sources. Reabsorption is the reason it can take over 20 years for a deficiency disease to develop. In comparison, if B12 deficiency is due to a failure in absorption, it can take only three years for a deficiency disease to occur. Since vitamin B12 is recycled in a healthy body, in principle, internal B12 synthesis could fulfil our needs without any B12 provided in the diet, but if cobalt in our diet is lacking, the problem is not so much a lack of B12 synthesising intestinal flora, as a lack of cobalt (which again will need other factors for efficient absorption).
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