Anisha Riggs
Butylated hydroxytoluene, or BHT, is a synthetic antioxidant and preservative used in perfumes and other cosmetic products. It is odourless and almost colourless, with a very long shelf life. BHT is used to prevent oxidation and maintain product performance and stability. It is typically used in concentrations of 0.1% to 0.5% in perfumes and cosmetics, and its use is regulated and considered safe by experts. However, there are concerns about its potential toxicity and environmental impact, particularly for aquatic life.
| Characteristics | Values |
|---|---|
| Full Form | Butylated Hydroxytoluene |
| Type | Antioxidant |
| Uses | Preservative in food and personal care products |
| Use in Perfumes | Extends shelf and odour life, slows down colour changes |
| Safety | Safe for the consumer at concentrations below 0.8% |
| Safety | Not considered an endocrine disruptor |
| Safety | Accused of having toxic effects on the liver, kidneys, and lungs at extreme doses |
| Safety | Classified as hazardous and very toxic to aquatic life |
| Odour | Almost odourless, very faint musty cresylic phenolic odour |
| Appearance | White to off-white crystalline powder |
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What You'll Learn
BHT is an acronym for Butylated Hydroxytoluene
BHT stands for Butylated Hydroxytoluene, a synthetic antioxidant derived from petrochemical raw materials. It is used in cosmetics and fragrance products, such as perfumes, to prevent oxidation and maintain product quality and stability. BHT is also known as an effective preservative in food and personal care products.
In perfumes, BHT is almost odourless and is typically used in concentrations of 0.1% to extend the shelf life and slow down colour changes. It is particularly useful in oxygen-sensitive materials and finished products, such as citrus oils and aliphatic aldehydes. BHT is also added to formulas containing fats or aqueous emulsions with specific active ingredients or plant extracts.
The safety of BHT has been a topic of discussion, with studies indicating potential toxicity and adverse effects on the liver, kidneys, and lungs at extremely high doses. However, these studies are not reflective of cosmetic product usage, as peroral administration and exposure via cosmetics differ significantly in terms of dosage. Furthermore, percutaneous penetration of BHT is slow and insignificant, resulting in negligible systemic exposure.
Regulatory bodies, such as the Scientific Committee on Consumer Safety (SCSS), have re-evaluated BHT's safety, addressing concerns about endocrine disruption. Current data, including that from the World Health Organization (WHO), does not confirm BHT as an endocrine disruptor. Its use is considered safe in cosmetic products, including those for children, when concentrations are below 0.8%.
BHT is classified as hazardous, particularly regarding aquatic life, with potential long-lasting effects on aquatic organisms. As a result, some suppliers are working towards discontinuing its use as a protecting agent for raw materials.
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BHT is an antioxidant
Butylated hydroxytoluene, or BHT, is an antioxidant used in perfumes and cosmetics. It is a stabiliser that helps maintain the properties and performance of a product when exposed to air, preventing changes in odour, colour, and texture. BHT is almost odourless and can be dissolved in alcohol, vegetable oil, and other similar substances. It is particularly effective in products that are sensitive to oxygen in the air, such as perfumes, fragrances, and oily cosmetics.
BHT is a synthetic product made from petrochemical raw materials. It is a grey-white powder with a slight musky odour and a long shelf life. BHT is more stable than many other antioxidants, such as tocopherol, and can provide longer protection even at low doses. It is typically used in concentrations of 0.1% in leave-on products and 0.5% in rinse-off products, although some sources recommend a maximum concentration of 0.8% to ensure safety.
The safety of BHT has been a topic of discussion, with some studies suggesting potential toxic effects on the liver, kidneys, and lungs at extremely high doses. However, these studies are not considered relevant to BHT exposure through cosmetic products, as the doses used were significantly higher. Additionally, BHT has been accused of having endocrine-disrupting properties, but recent re-evaluations by organisations like the World Health Organization (WHO) and the Scientific Committee on Consumer Safety (SCSC) have concluded that it does not meet the criteria for identification as an endocrine disruptor.
BHT is classified as highly toxic to aquatic life and can cause long-term adverse effects on aquatic organisms. As a result, there have been efforts to discontinue its use as a protecting agent of raw materials. However, in cosmetic and food products, BHT is generally considered safe for consumer use when used within the recommended concentration levels.
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BHT is used to extend shelf life
Butylated hydroxytoluene (BHT) is a synthetic antioxidant derived from petrochemical raw materials. It is a highly effective preservative used in food, cosmetics, and personal care products. BHT is particularly useful in extending the shelf life of perfumes and other oxygen-sensitive materials.
BHT is a stabiliser that helps maintain the properties and performance of a product when exposed to air. It prevents oxidation, which is a chemical reaction between a component of a formula and oxygen. By inhibiting oxidation, BHT slows down colour changes and prevents changes in odour and texture. This is especially important for perfumes, as they are sensitive to oxygen and can degrade when exposed to air.
The optimal concentration of BHT in leave-on products is 0.1%, and 0.5% in rinse-off products. In perfumes, BHT is typically used at a concentration of 0.1% or 1 gram per kilogram. It is odourless at these levels, but in its pure form, it has a faint musty or musky odour.
BHT is safe for consumer use at concentrations below 0.8% in both leave-on and rinse-off products. Its use is strictly regulated, and it is considered safe by experts for cosmetic products, including those intended for children. However, at extremely high doses, BHT has been associated with toxic effects on the liver, kidneys, and lungs, as well as potential endocrine disruption.
Overall, BHT is a valuable ingredient in the perfume industry due to its ability to extend the shelf life of fragrances and maintain their desired qualities over time.
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BHT is safe for use in cosmetics
BHT, or butylated hydroxytoluene, is a synthetic chemical that acts as a preservative and antioxidant in foods, cosmetics, and skincare products. It is often used in creams and lotions as an efficient stabiliser to prevent the product from spoiling when exposed to air. It is also used to preserve the oils and fats found in cosmetics.
BHT is considered safe for use in cosmetics when used in low concentrations. The Cosmetic Ingredient Review Expert Panel concluded in 2002 that BHT is safe as used in cosmetic formulations, and in 2019 they determined that the maximum concentration of use in leave-on products remains the same as in 2002 (at 0.5%). The European Union restricts the use of BHT in mouthwash to 0.001% concentration, in toothpaste to 0.01%, and to 0.8% in other cosmetics.
Clinical testing did not find any depigmentation associated with dermal exposure to BHT, and there was no significant irritation, sensitization, or photosensitization. BHT applied to the skin appears to remain in the skin or pass through only slowly and does not produce systemic exposures to BHT or its metabolites seen with oral exposures.
In the United States, BHT is classified as generally recognized as safe (GRAS) based on a National Cancer Institute study from 1979 in rats and mice. The FDA has approved BHT as a food additive in limited quantities in some foods.
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BHT is toxic to aquatic life
Butylated hydroxytoluene, or BHT, is a synthetic antioxidant and preservative used in perfumes and cosmetics to prevent oxidation and extend shelf life. While BHT is generally considered safe for human use, there are concerns about its potential toxicity to aquatic life.
BHT has been detected in aquatic ecosystems, and studies have shown that it can be toxic to zebrafish larvae, causing adverse effects such as decreased heart rate, morphological abnormalities, and impaired organ development. These findings suggest that BHT may pose risks to aquatic organisms and highlight the need for careful environmental monitoring and regulation.
The potential toxicity of BHT to aquatic life has been recognised by organisations such as the United Nations Environment Program, which noted its moderate to high potential for bioaccumulation in aquatic species. Similarly, under the Convention for the Protection of the Marine Environment of the North-East Atlantic, BHT is listed as a chemical of potential concern due to its toxicity to aquatic organisms and potential to bioaccumulate.
While the use of BHT in cosmetics is generally regulated to ensure safe concentrations for consumers, its presence in aquatic ecosystems and potential impacts on aquatic life remain a cause for concern. Further research and environmental monitoring are necessary to fully understand the risks posed by BHT to aquatic ecosystems and to develop appropriate mitigation strategies.
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Frequently asked questions
BHT, or Butylated Hydroxytoluene, is an antioxidant used in perfumes and cosmetics to prevent oxidation and degradation of the product when exposed to air, thus extending its shelf life.
BHT is generally considered safe for use in cosmetic products at concentrations below 0.8%. However, some studies have suggested potential toxic effects on the liver, kidneys, and lungs at extremely high doses by ingestion.
BHT is a grey-white powder with a slight musky odour. It is almost odourless when used in perfumes. It is soluble in DPG, alcohol, vegetable oil, and similar substances but not in water.
