What Is Dimyristyl Thiodipropionate?
Dimyristyl Thiodipropionate, sometimes listed on labels as Ditetradecyl 3,3′-thiobispropionate, is a synthetic antioxidant derived from myristic acid, a fatty acid found in coconut oil and palm kernel oil. Chemists first explored this molecule in the mid-20th century while looking for stable antioxidants that could protect fats and oils from turning rancid. They soon discovered its useful role in personal care, and it has been part of modern cosmetic formulation ever since.
The ingredient is produced by reacting myristyl alcohol with thiodipropionic acid under controlled temperature and pressure. The result is a waxy, off-white solid that melts easily into oils and emulsions. Its structure contains two long, 14-carbon chains, which let it blend well with plant oils, silicones and other lipids used in skin care.
Because it is oil-friendly, Dimyristyl Thiodipropionate shows up in rich face creams, body butters, sunscreens, lip balms, anti-aging serums and hair masks. Brands add it to keep the delicate oils in these products fresh for longer, helping the formula stay stable on the shelf and on your skin.
Dimyristyl Thiodipropionate’s Cosmetic Benefits/Uses
In cosmetics Dimyristyl Thiodipropionate works as an antioxidant. It slows down the oxidation of oils, vitamins and fragrances inside a formula, which helps prevent color changes, off odors and loss of potency. By protecting the product, it indirectly supports skin benefits too, since active ingredients remain effective for the length of the product’s life cycle.
Who Can Use Dimyristyl Thiodipropionate
Dimyristyl Thiodipropionate is considered suitable for most skin types, including normal, dry, combination and even sensitive skin, because it sits in the formula at very low levels and has a low irritation profile. People with very oily or acne-prone skin might prefer lightweight products since rich butters or heavy oils that often accompany this antioxidant can feel occlusive.
The ingredient itself is synthetic or plant derived, using myristic acid that typically comes from coconut or palm sources rather than animal fats, so it can fit into vegan or vegetarian routines when the brand’s full supply chain confirms plant sourcing.
No specific studies flag Dimyristyl Thiodipropionate as a concern for pregnancy or breastfeeding. It is classed as generally safe for topical use, yet this is not medical advice and anyone who is pregnant or nursing should run every skincare product past their healthcare provider just to be sure.
The molecule does not absorb UV light and is not known to cause photosensitivity, so daytime use need not raise extra sun-care concerns beyond wearing a daily SPF as usual.
Potential Side Effects/Adverse Reactions
Side effects and reactions to the topical application of Dimyristyl Thiodipropionate can vary from person to person. The points below outline potential issues yet they remain uncommon when the ingredient is used correctly within a well-formulated product.
- Mild skin irritation such as transient redness or stinging
- Allergic contact dermatitis in individuals already sensitised to similar fatty alcohol derivatives
- Acne-like breakouts in users who are extremely acne-prone when the overall formula is very rich in oils
- Eye irritation if the product accidentally gets into the eyes
If you experience any unwanted reaction discontinue use and consult a qualified healthcare professional.
Comedogenic Rating
Rating: 2 / 5 Dimyristyl Thiodipropionate carries two 14-carbon chains, giving it a fatty character that could, in theory, clog pores, yet it is typically used at very low percentages solely to protect oils in the formula rather than to provide heavy emollience. Most finished products contain it at under 1 %, which keeps the risk modest. For that reason it earns a mild score of 2 instead of a clear non-comedogenic 0.
Given this low to moderate rating, the ingredient is generally acceptable for acne-prone skin, though extremely breakout-sensitive users may still prefer lighter textures.
The final pore-clogging potential depends more on the overall mix of butters, waxes and silicones surrounding it than on Dimyristyl Thiodipropionate itself.
Summary
Dimyristyl Thiodipropionate is an oil-soluble antioxidant that shields the delicate lipids, vitamins and fragrances inside cosmetics from oxygen. By donating electrons and capturing free radicals it slows rancidity, color shift and loss of efficacy, which keeps the product fresh on the shelf and performing well on the skin.
While not a headline ingredient like hyaluronic acid or retinol, it quietly appears in a wide range of creams, balms and sunscreens where brand chemists want reliable long-term stability without changing texture or scent.
Safety profiles from industry and regulatory bodies view it as low risk for irritation or sensitization at customary use levels. Even so, skin is personal so it is wise to patch test any new product that contains Dimyristyl Thiodipropionate to confirm compatibility.