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SLS in shampoo: what it is and how Dr. M Kelp Shampoo compares
SLS is a cleansing ingredient. For shampoo, the rinse is part of the information.
Sodium lauryl sulfate, SLS, is often discussed as a one-word verdict. A more useful start is the kind of product, the whole formula and how long it stays on the skin or scalp. In a shampoo, cleansing is followed by rinsing.
Cosmetic Ingredient Review’s December 2025 reference table describes SLS as suitable in formulas intended for brief, intermittent contact followed by thorough rinsing. It considers prolonged skin contact separately. The table is the CIR SLS PDF. This site does not describe a “high risk” percentage. Dr. M Hokkaido Kelp Shampoo keeps SLS low, at ≤5%, in that shampoo only.
If avoiding SLS matters to you, read the current ingredient list or ask for a label photo. “Please send the full ingredient list” is a clearer question than “Is it chemical-free?” For this shampoo: wet hair and scalp, gentle massage through the 2–3 minute wash, thorough rinse. Do not leave a rinse-off product on longer than directed. If you have a known ingredient allergy or a scalp condition, take the label to a qualified professional. An article cannot decide suitability for you.
SLS and the rest of the formula: Dr. M Hokkaido Kelp Shampoo
Here is what the label and this site state for Dr. M Hokkaido Kelp Hair & Scalp Shampoo, set against the questions worth asking of any shampoo.
| What to check on a shampoo | Dr. M Hokkaido Kelp Shampoo |
|---|---|
| SLS level | Low-SLS formula, ≤5% SLS |
| Mineral oil | 0% |
| Silicone | 0% |
| Parabens | 0% |
| Key ingredient story | Kelp from Hokkaido |
| How it is used | Wet hair, massage 2–3 minutes, rinse thoroughly |
| NPRA notification | NOT220504152K |
See the full ingredient highlights, read about Hokkaido kelp in hair care and how to use the shampoo, or compare bottles in the bundle calculator.
Quick answers
What is SLS in shampoo?
SLS (sodium lauryl sulfate) is a cleansing ingredient. In a shampoo it is used briefly and then rinsed off.
How much SLS is in Dr. M Hokkaido Kelp Shampoo?
It is a low-SLS formula, at ≤5% SLS, with 0% mineral oil, 0% silicone and 0% parabens.