Kelp Extract
Brown algae extract. Contains alginates and minerals, provides mild hydration. Marketing claims of detox/slimming are not supported.
Evidence by route
Topical application
Marketing-driven plant extract. Contains iodine, which could theoretically affect thyroid function with systemic exposure, but no clinically significant effects have been described from topical use at standard concentrations.
How to read tiers A–F
- DNo data, or very weak or conflicting data
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Caution
- Suitable for
- Normal, Dry, Oily, Combination
- Use with caution
- Sensitive
About this ingredient
Kelp Extract (Laminaria digitata / Laminaria saccharina Extract) is an extract from brown seaweed of the Laminariaceae family. Grows in cold Atlantic and Pacific waters. Contains alginates, fucoidan, iodine, minerals (magnesium, calcium, iron), B-group vitamins. Where applied. Moisturizing creams, masks, serums, cellulite and body-contouring formulas (0.1-5%). In Spain in La Mer (Crème de la Mer – fermented Macrocystis pyrifera extract), Natura Bissé Marine, Aqua Marina, Talgo and Phytomer thalassotherapy. Evidence base. In vitro – antioxidant activity, tyrosinase and matrix metalloproteinase (MMP) inhibition by fucoidan. Direct clinical RCTs on topical kelp extract on skin are few; small studies show mild hydration. Marketing claims of "detox," "slimming," and "cellulite removal" with topical use are unproven. Safety. CIR has not made a separate assessment. High iodine content is theoretically concerning in thyroid disorders – but topical iodine absorption is clinically insignificant. Allergic reactions are rare, possible in patients allergic to iodine or seafood. Pregnancy – use with caution in patients with hyperthyroidism or on L-thyroxine. Lactation – use with caution for the same reason. In healthy people safe topically at cosmetic concentrations.
Frequently asked questions
Is Kelp Extract safe during pregnancy?
Kelp Extract should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.
What skin types is Kelp Extract for?
Kelp Extract suits: normal, dry, oily, combination. Use with caution in: sensitive.
What is Kelp Extract and what does it do in cosmetics?
Brown algae extract.
What's the INCI name for Kelp Extract?
The INCI name is Macrocystis Pyrifera Extract. It may also appear as: Kelp Extract, Macrocystis Pyrifera (Kelp) Extract.
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