b12 tablets versus injections are more effective than can you take b12 tablets instead of injections Vitamin B12 injections vs tablets: which is better Oral vitamin B12 versus intramuscular

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Additionally, it has been shown to improve cognitive function for healthy older adults and also for people with mild cognitive impairment who are at an increased risk of progressing to Alzheimers disease

In pernicious anemia, the issue is absorption

If you are not deficient, I believe it is safe to take a B12 supplement at a lower dose

Oruros Carnival

However, your healthcare provider may recommend tests such as: Vitamin A Vitamin D Vitamin K Methylmalonic Acid Test Homocysteine Test Intrinsic Factor Antibody Complete Blood Count (CBC) Blood Smear Your doctor might suggest these other than vitamin B12 test because: To treat blood conditions if you have vitamin B12, folate, anemia, or any uncertain cause