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Vitamin B12 Deficiency Low B12 levels cause a range of health problems

For patients who have not previously been diagnosed with vitamin B12 deficiency or prescribed a vitamin B12 injection, the medicine can be offered if vitamin B12 deficiency is suspected based on signs, symptoms and/or risk factors, though confirmation of vitamin B12 deficiency by a reliable test kit should also be considered

And one of the most controllable

ifosfamide, cisplatin and doxorubicin), are associated with decreased carnitine levels and occasionally with true carnitine deficiency [36, 37]

Cellular validation confirms this dual impact of structural remodeling and functional dysregulation: TMAO impairs T-tubule integrity in cardiomyocytes, disrupting calcium transient spatiotemporal synchrony

There's so many animal studies that have looked at all those things