does it improve the hairs texture(thickness of strands etc.)????
Yes, but not much, sometimes you might not at all see the diff.
To achieve better hair texture and "horizontal volume" (thickness), Biotin alone isn't enough. You require additional vitamins like B-complex, B1, B12, iron, folic acid and fo-ti (a derivative of he shouwu, a chinese herb).
In conclusion, Biotin provides quantity (as in length). To get quality (texture, thickness etc.), you need the rest.
Where can I get all the vitamins and Biotin?