Its prohibited in all sports governed by WADA regulations
doi:10.1136/bmj.333.7564.385
Hematologic disorders like chronic myelogeneous leukemia, promyelocytic leukemia, polycythemia vera, and hypereosinophilic syndrome can present as elevated serum blood levels of vitamin B12, which is also known clinically as serum cobalamin, note the authors of a 2013 research review published in the journal Clinical Biochemistry
Vegetarian sources of B12 include chlorella, nori, nutritional yeast and certain mushrooms, but many vegans and vegetarians have insufficient levels of B12 because its not widely found in plants. According to Mullane, not getting enough B12 can result in issues like anaemia, fatigue and more intense symptoms including shortness of breath, palpitations, pale skin, muscle weakness, numbness and tingling in hands or feet, blurred vision and memory loss
Effective weight loss still relies on caloric balance, exercise and long-term lifestyle habits[9]
It definitely has given me more energy