Are you equating low B12 levels with low tinnitus? Vitamin deficiencies have been known to make tinnitus worse. Just make sure the B12 you're taking is the high quality, active form (Methylcobalamin).
I also have low b12 and iron deficiency. I take a lot of supplements but it may be that I need to eat meat again. Tinnitus got better after starting iron supplements, but it might be coincidental.
If T is because of iron deficiency, you get it in your left ear. Blood vessel related.
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