Concentrated solid shampoo that ships with no plastic packaging at all — the bottle is the waste in liquid shampoo, and a bar removes it entirely.

Shampoo and conditioner bars sold as a pair, formulated as detergent bars rather than soap — which is why they behave more like the bottled product people are used to.
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Avoid buying a shampoo bar without a conditioner bar if your hair is anything but very short — that is the most common way this switch fails. Avoid leaving either bar in standing water, which dissolves them fast.
Straight answer: we're a research team, not a testing lab. Here's exactly what our rating is based on — and what it isn't — so you can weigh it honestly.
Anything that adds a known microplastic, PFAS, or off-gassing source — a non-stick coating, a plastic surface against food or skin, vinyl/PVC — is downgraded or cut. We only list what clears that bar.
Concentrated solid shampoo that ships with no plastic packaging at all — the bottle is the waste in liquid shampoo, and a bar removes it entirely.
A glass foaming bottle you keep, refilled by dropping a tablet into water — so the thing being shipped is a tablet, not a bottle of water.
Chewable toothpaste tablets in a refillable glass jar — no tube, and the tube is the whole problem with toothpaste packaging.
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