These symptoms aren't always due to vitamin B12-deficiency anaemia, but if you have them see your GP. Avoiding vitamin B12 deficiency Experts say adults aged 19 to 64 require around 1.5 micrograms a day of vitamin B12, and you should be able to get this through your diet
Walaszek Z, Szemraj J, Narog M, et al
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This is counterproductive and dangerous
(7) I A Vinogradova 1, A V Bukalev, M A Zabezhinski, A V Semenchenko, V Kh Khavinson, and V N Anisimov (2007) Effect of Ala-Glu-Asp-Gly peptide on life span and development of spontaneous tumors in female rats exposed to different illumination regimes Bulletin of Experimental Biology and Medicine, 2007 Dec, Volume 144 (Issue 6), Pages 825-30