[yareally]

My wife's and my B12 levels (shown by lab tests) were in the toilet after having a 2+ week covid infection. No energy, memory wasn't great. After getting a B12 injection, our energy levels are back to normal and memory is mostly recovered and I feel optimistic it will continue. Some of the memory function is probably just retraining myself to function how I was after having my body deprived of an essential vitamin.

May not be the case for everyone, but it can't hurt to run it by your doctor and ask what they think about checking the most usual suspects (B12, D levels, Thyroid, Iron [in women and vegans/vegetarians]), etc. B12 is important for many functions in your body, including immune response.

I still take high potency B12 (Methylcobalamin) sublingually every morning. It's water soluble, so you'll expel whatever you don't use.