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Low B12 is one of the most common causes of fatigue and brain fog

Most people living in industrialized nations tend to get enough vitamin B12, although not all

Over a single dose, the loss is negligible

Symptoms include fatigue, faintness, headaches, pale skin, loss of appetite, weight loss, pins and needles and a sore, red tongue

If you are low in B12, you may also want to look into whether you may have other nutrient depletions as well, including depletions in iron, vitamin A, vitamin E, the B vitamins, potassium, and iodine , which are all required for proper thyroid function

The temporal association with starting B12 supplementation may simply reflect chance occurrence rather than causation