I have heard of thinning of hair being hereditary. You can recommend your friend for hair extensions. I am using hair extensions for hair styling , it can also be a solution to hair loss. I highly recommend to try these out.
Excess of B6 can cause nervous system damage. Both B6 and B12 can cause severe health problem. Consult the doctor for the amount required for your body.
I am prone to experiment with my hairstyles using hair colors, hair accessories and hair extensions. Using all these I also keep my natural hair nourished using oil and vinegar once a week.