My sister is 39 years old. She feels weakness and tiredness without doing anything Diagnosed with B12 deficiency in August taking supplements supradyn, well woman and neurokind d3 initially was feeling very good with supplements Got the b12 test done again in October which was fine 1000 pg/ml but of late again started weakness just walking few steps gets me tired and weak if any further tests to be done Taking diamicron 60mg and janunet 100/1000 mg for sugar Thyroxine 50 mcg Lipanthyl 145 mg and Supplements for b12