I read somewhere that high dose of vitamin b6 and b12 can reduce certain problems and enhance myself.

I bought the Neurobion thinking it is supplement,
each pill contains
- 100 mg vit B1 (thiamine disulfide)
- 200 mg vit B6 (pyridoxine hydrochloride)
- 200 mcg B12 (cyanocobalamin)
- fish gelatin

However i read the indication it says:
"Indicated for neurological and other disorders associated with disturbance of metabolic functions influenced by B complex vitamins, including diabetic polyneuropathy, alcoholic peripheral neuritis and post influenzal neuropathies. Neurobion is also recommended for the treatment of neuritis and neuralgia of the spinal nerves, especially facial paresis cervical syndrome, low back pain, ishchialgia,"

The instruction also says that "...The effect of L-dopa may be reduced when vitamin B6 is administered concomitantly...Loop diuretics, eg furosemide: In long-term use, the blood level of thiamine may be reduced...prolonged overdose of vit B6, ie for longer than 2 months and more than 1g per day, may lead to neurotoxic effect..."

It also talks about what follow-up therapy for course of injections..
The description looks more like medicine than supplement.

Can i take it regularly without having any of the conditions mentioned above?

You can actually ask your GP on this. Best not to simply take supplement