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A soft gelatin or starch shell, sometimes coloured and translucent, enclosing a measured dose of fragranced bath oil. Warm water dissolves the shell in a minute or two and the oil disperses.

Component	Typical
Shell	Gelatin, glycerin, water, colour; or a starch/seaweed alternative
Fill	Mineral oil, plant oils, esters, fragrance, sometimes vitamin E

The advantage is real: the oil never meets air until the moment of use. No headspace, no oxidation across a part-used bottle, no preservative needed, and an exact dose every time. It is the same reasoning that makes a monodose Ampoule worth its packaging.

They look like sweets. Small, glossy, brightly coloured, translucent, sometimes fruit-scented and shaped like pearls or fish — and stored, typically, in an open jar on the side of a bath, at a height a small child can reach.

Ingestion of bath capsules by young children is a recognised poison-centre call. The gelatin shell is harmless; the fill is a fragranced oil, and the meaningful risk with ingested oils in children is aspiration — oil entering the lungs, which causes a chemical pneumonitis and is a genuine medical emergency rather than a stomach upset.

The controls are simple and worth stating: store them out of reach and out of sight, keep them in a closed container rather than an open decorative jar, and treat them as a cosmetic rather than as bathroom ornaments. If a child swallows one, contact a poison centre — and do not induce vomiting, because that increases aspiration risk.

• Oil in a tub is slippery. The fall risk described at Bath Oil applies in full. Non-slip mat, careful exit, rinse the tub.
• Warm water, not hot, or the shell dissolves before the bath is comfortable.
• One is usually enough. The dose is designed for a full tub.
• Gelatin is animal-derived, which matters for anyone avoiding it; starch and seaweed shells exist.

Cosmetic in the US — FDA primary category (02) bath preparations — with no premarket approval. Colour additives, in both the shell and the fill, must be approved by FDA for the intended use, and certified colours must come from FDA-certified batches.

Notably, no US cosmetic regulation requires child-resistant packaging or a "do not eat" warning for these, despite the resemblance. The Poison Prevention Packaging Act administered by the Consumer Product Safety Commission covers certain hazardous household substances, and cosmetics of this kind generally fall outside it. The single-dose capsule format used for laundry detergent was subject to sustained regulatory and industry action for exactly this reason after a wave of childhood ingestions; bath capsules have never had comparable attention because the contents are far less toxic — the aspiration risk is the residual concern.

In the EU, permitted colorants come from the Annex IV closed positive list of 153 entries, and named fragrance allergens must be declared above 0.01% in rinse-off products — a list substantially expanded by Regulation (EU) 2023/1545.

Two to three years, which is long for an oil product precisely because the shell excludes air.

The failure modes are physical: shells soften and stick together in a humid bathroom, and leak if squashed or heated. A capsule that has gone tacky or lost its shape has been damp, and a jar of fused capsules should go. Store them dry, cool, sealed — and out of reach.

• Bath and Body — the shelf this sits on, and the rest of it.
• Cosmetics — what the label is legally allowed to say, and the full catalogue.
• The rest of Soaking — Bubble Bath · Bath Oil · Bath Salts · Bath Bomb · Bath Milk · Shower Steamer.
• Regulatory statements here follow the FDA and EU sources listed on Cosmetics, read 16 August 2026.