Can i take iron vitamina c and biotin at the same time to prevent hair loss?

Yes but...: It is safe to take those at the same time, in fact Vitamin C improves iron absorption. But you did not tell us your age or gender. Iron is often needed by menstruating women but most men and post-menopausal women should NOT take it unless tested to be deficient, as excess iron increases risk of heart disease. I also advise taking a quality multivitamin and having thyroid levels checked.

Sure: I will be pleasantly surprised if it does any good. If you have diffuse hair loss that is not telogen effluvium, the most important treatable cause is hypothyroidism.