try HASK Biotin Boost Thickening Shampoo and Conditioner. It contains biotin, collagen and coffee to visibly improve hair thickness and body, without weighing it down. Why choose: This biotin ...

These days, thickening shampoos are a dime a dozen, most of which contain ingredients like biotin, saw palmetto ... thanks to the collagen in its formula, which makes hair look and feel thicker ...

Shampoo makes my hair greasy and lank." If you worry about greasy hair, Absolute Collagen's Thickening Collagen Complex Shampoo (£18.89) is another option. It's been clinically proven to boost ...

Collagen supports hair structure and scalp health, while keratin repairs hair strands and enhances hair smoothness and shine.