Is DMG or ( previously b15) is required to take ?

[Hamayeshguy]

Dimethylglycine or DMG has some vital role in brain functioning along with B12 but it's not added to b complex because it's not considered b vitamin anymore and now is known as a drug ,

Any comments?

[Hamayeshguy]

Also b4, b15+3 and vitamin f also have vital role in our body and energy production but are not considered vitamin because our body can make them. Maybe some people's body can't make them because of mutation of genes,Any comment