Safety Review Evaluates 12hexanediol in Cosmetic Formulations

2026-10-26 00:00:00

A safety review of 1,2-Hexanediol in cosmetic formulations highlights in vitro cytotoxicity in RAW 264.7 and HK-2 cells at concentrations of 0.5% to 1.0%, and environmental phytotoxicity inhibiting seed germination and root growth at levels as low as 0.1%. The findings call for reassessing use concentrations and monitoring ecological effects.

1,2-Hexanediol, a polyol widely used in cosmetics and personal care products, is valued for its preservative-boosting and moisturizing properties. As toxicological and environmental research expands, the ingredient’s safety profile is drawing closer scrutiny from formulators and researchers. Laboratory and ecological data now point to potential risks at concentration levels relevant to some commercial products.

Toxicology findings

In vitro tests indicate that 1,2-Hexanediol has measurable biological activity. In a RAW 264.7 macrophage model, cell viability fell below 40% when the concentration reached 0.5%. In kidney-derived HK-2 cells, viability dropped below 10% at 1.0%, with cytotoxicity exceeding 50%.

Because many personal care products on the market contain more than 2% 1,2-Hexanediol, the laboratory results suggest that the ingredient may carry notable cytotoxic risk at certain concentrations. The potential implications for human health warrant attention from product developers.

Environmental toxicity

Beyond cell-level effects, environmental assessment has identified potential phytotoxicity. Experiments showed that the substance inhibited seed germination and root growth in lettuce (L. sativa) and cabbage (B. campestris).

Test organism	Concentration	Observation
L. sativa	0.1%	Complete inhibition of seed germination and root growth
B. campestris	0.1%	Germination observed
B. campestris	1.0%–5.0%	Complete inhibition of germination

The research indicated that 1,2-Hexanediol can damage plant growth even at a relatively low concentration of 0.1%. When consumer products containing the ingredient enter the environment through domestic wastewater, the potential impact on ecosystems should not be overlooked.

Implications for industry

Plant toxicity is not directly equivalent to human toxicity, but it remains a useful indicator in assessing the potential risks of chemicals. Given the cytotoxicity observed for 1,2-Hexanediol, the industry faces higher demands for stability and safety evaluation in formulations. Developers should reassess use concentrations based on available toxicological data and monitor degradation and ecological effects after release into the environment.

Frequently Asked Questions

Does the plant toxicity of 1,2-Hexanediol mean it is necessarily harmful to humans?

Plant toxicity testing is one method for assessing a chemical’s environmental risk. It is not directly equivalent to human toxicity, but the cytotoxicity observed in studies, including effects on RAW 264.7 and HK-2 cells, suggests that the ingredient may pose biological toxicity risks at higher concentrations. Further toxicological testing is needed for a full assessment.

What concentration of 1,2-Hexanediol is typically used in personal care products?

Industry practice indicates that many personal care products contain more than 2% 1,2-Hexanediol. Laboratory research has shown significant cytotoxicity at concentrations of 0.5% to 1.0%, and formulators should refer to the latest safety assessment data when designing products.

How should the potential environmental impact of 1,2-Hexanediol be understood?

Experimental data showed that 1,2-Hexanediol inhibited plant seed germination and root development at concentrations as low as 0.1%. When products containing the ingredient are used in large volumes and enter water systems, they may adversely affect plant growth. Environmental safety evaluation is therefore an important part of product lifecycle management.

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