Coleus Forskohlii Root Extract

Coleus forskohlii root extract is a botanical skin-conditioning ingredient typically used at low concentrations, but it contains bioactive diterpenes (e.g., forskolin) and other phytochemicals that can trigger stinging or erythema in reactive or eczematous skin. While not as predictably irritating as acids or retinoids, plant extracts have a meaningful rate of irritant and occasional allergic contact dermatitis in patch-test populations, especially in compromised barriers. Given the uncertainty of extract standardization and the higher-risk sensitive-skin subgroup, a mild (0.4) score best reflects prudent clinical caution. Safety Notes: In mass-market leave-on skincare, Coleus forskohlii root extract is typically used as a low-level botanical adjunct in blends, often around 0.001–0.1%, with the lowest observed usages around 0.0005% when included as part of a multi-extract complex. Higher-strength consumer-available “slimming/firming” body serums and targeted treatment products sometimes dose the extract at 1–5% to deliver meaningful levels of forskolin-containing actives, with 5% representing the upper end seen in OTC retail products (higher levels are limited by odor/color, skin tolerance, and supplier standardization). Rinse-off products generally sit toward the low end because of short contact time, while leave-on body treatments account for most of the high-end usage.