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THF plays an important role in DNA synthesis, so reduced availability of THF results in ineffective production of cells with rapid turnover, in particular red blood cells, and also intestinal wall cells which are responsible for absorption

Its also vital for making red blood cells

Nature (2014) 4

Our liquid Methylcobalamin Vitamin B12 for cats is specially formulated to support overall health, focusing on red blood cell formation, nervous system function, and energy levels.This essential vitamin aids in protein synthesis, fat and carbohydrate metabolism, and brain health.Its especially helpful for cats suffering from low energy, poor appetite, or digestive issues

"Antiepileptic drugs interact with folate and vitamin B12 serum levels" (PDF)

Useful metrics include body weight measured at consistent times, ideally morning after waking