This bar is aimed at people with sensitive, itchy, or easily irritated scalps who want a fragrance-free, low-additive wash. Because it doubles as a hair and body wash, it also suits anyone who wants to simplify a shower routine or pack light for travel.

It's a consumer product rather than a salon-only professional formula, and needs no special technique beyond rubbing the bar directly on wet hair or skin — suitable for first-time solid-shampoo users as much as people already used to bar shampoos.

The main reason to pick this over a standard shampoo is the sensitive-scalp formulation: it's free of sulfates, silicones, alcohol, and synthetic fragrance, and it's pH-balanced to be closer to skin's natural level rather than the more alkaline range typical shampoos sit at — aimed at people whose scalp reacts to fragranced or sulfate-based washes.

It also solves two things at once, working as both a hair and body cleanser, and being a solid bar means it skips the plastic bottle and packs more easily than a liquid shampoo for travel.

1. Wet your hair (and skin, if using as a body wash) thoroughly.
2. Rub the bar directly between your palms, or against your wet hair or skin, until a light lather builds.
3. Massage the lather into the scalp and through the hair.
4. Rinse thoroughly.
5. Set the bar on a well-draining surface to air dry between uses so it doesn't stay wet and soften.

Pros:

• Fragrance-free and formulated without sulfates, silicones, or synthetic dyes, lowering the odds of scalp irritation
• Chamomile and rosemary extracts are included specifically to soothe an already-irritated scalp
• Doubles as a hair and body wash, and the solid format means no plastic bottle and easy packing for travel

Cons:

• A bar lathers less richly than a bottled shampoo, so people with very long or thick hair may need to work it against their hair longer to build enough foam
• It has no heavy conditioning agents, so those with dry or coarse hair will likely still want a separate conditioner
• The bar needs to air-dry on a well-draining surface between uses, or it softens and wears down faster than expected