Made for people whose scalp gets oily fast: roots that look flat or greasy a day after washing, or hair that carries a lot of styling-product buildup.

Biolage lists it for oily scalps and says it is suitable for colour-treated hair. It is a salon-professional line sold for home use, so no special training is needed.

Most clarifying shampoos strip everything and leave hair rough. This one is built around scalp balance: the fermented tea blend is there to calm, and the glycolic acid clears the dead cells and buildup that make an oily scalp feel heavy. The result is a clean, fresher-feeling scalp with more lift at the roots, without that squeaky, dried-out finish.

It is part of the Scalp Sync system, so it can be paired with the Universal Conditioner or the Purifying Scalp Concentrate pre-wash if you want a full routine for an oily scalp.

Massage into wet hair and scalp to remove residue and excess oil.

Rinse thoroughly.

Follow with Scalp Sync Universal Conditioner, applied mainly to the lengths.

Pros:

• Lifts residue, excess oil and styling buildup in one wash
• Glycolic acid gives a gentle exfoliating effect at the scalp
• Leaves roots with more lift and volume
• Silicone-free, so it will not add weight at the roots
• Safe on colour-treated hair

Cons:

• Uses a sulfate cleanser (sodium laureth sulfate), which is more than a dry or sensitive scalp may need
• Aimed at oily scalps; people with dry lengths should follow with conditioner
• Contains fragrance and menthol, which some sensitive scalps may not tolerate