For people with fine, thin or sparse hair who want more body, and for hair that turns brittle or breaks while brushing or under the dryer and straightener. Mon Platin designed it to be applied to the specific areas that look thinnest.

It is a retail, leave-in styling treatment for home use. It is a cosmetic volume product; it does not treat hair loss or regrow hair, so anyone with sudden or significant shedding should see a doctor or dermatologist.

Fine and thinning hair usually has two problems at once: it lacks body, and it breaks easily under heat. Hyloren Boosting Hair Serum handles both. Its calcium compound and hyaluronic acid are absorbed into the strand to give a thicker, fuller feel, and the polymer blend shields the cuticle while you blow-dry or straighten. Because it is a light liquid rather than a mousse or cream, it adds volume without stickiness or crunch, and you can place it exactly where the hair looks sparsest.

Use on damp or dry hair.

• Apply a small amount directly to the thin and sparse areas of the hair.
• Distribute through the area with your fingers.
• Blow-dry or style as usual; do not rinse.
• Use daily for best results, together with the Hyloren Boosting Shampoo and Hair Mask.

Pros:

• Lightweight enough for fine hair, which is easily weighed down by heavier volumizers.
• Can be targeted to just the thin or sparse areas instead of the whole head.
• Doubles as a heat protectant for blow-drying and straightening.
• Brand says it helps shorten drying time and leaves no oily feel.

Cons:

• The fuller look is cosmetic and lasts until the next wash; it is not a hair-loss treatment.
• 50 ml goes quickly if applied all over long hair.
• Full ingredient list not published online.