Vitamin M is also known as vitamin B9 or folic acid or vitamin BC.

Vitamin M is also known as vitamin B9, folic acid or vitamin BC. This vitamin is very common in biological systems. Vitamin M in collaboration with Vitamin B12, protecting body against the development of various tumors, in particular lung tumors.

https://www.sbs.com.au/language/serbian/en/podcast-episode/are-you-deficient-in-vitamin-m/895wu3k4c