The formula contains rosemary and ylang-ylang oils — will it irritate a sensitive scalp?

Rosemary leaf oil and ylang-ylang flower oil are included for their invigorating character and traditional use in scalp vitality products, but they are known sensitizers for some people. If you have a history of reactions to fragranced cosmetics, essential oils, or botanical extracts, do a patch test before full use: apply a pea-sized amount behind the ear or on the inner forearm, leave for 10 minutes, rinse, and wait 24 hours.

Signs of irritation include persistent itching, redness, a burning sensation, or increased flaking that was not present before. If any of these appear, stop use immediately and switch to a fragrance-free, minimal-ingredient shampoo until the scalp barrier recovers. The source material explicitly notes that if the scalp feels irritated or overly dry, it is better to reduce use or choose a milder option.

Even without a known sensitivity, start with once-weekly use for the first two weeks. This lets you gauge tolerance while still giving the fucus, horsetail, and leek extracts a chance to work. If you are pregnant, breastfeeding, or managing a chronic scalp condition such as seborrheic dermatitis or psoriasis, consult a dermatologist before adding an essential-oil-based product to your routine.