Triheptanoin

Triheptanoin is a medium-chain triglyceride ester used primarily as an emollient/skin-conditioning agent, typically at a few percent up to higher levels in barrier-supportive formulations. As a non-volatile, non-reactive lipid, it is generally well-tolerated with low irritancy and low sensitization potential in patch testing, though any ester/oily emollient can rarely sting or feel occlusive on highly reactive or impaired skin. Given the sensitive-skin focus and the need to avoid underestimating rare reactions, it fits best as very gentle rather than completely inert. Safety Notes: Triheptanoin is used in cosmetics primarily as a lightweight emollient/skin-conditioning ester and is sometimes present at very low levels (~0.1–1%) as part of an emollient blend in lotions, sunscreens, and makeup. In anhydrous leave-on formats (facial oils, balm/ointment-type moisturizers, barrier products) it can function as a main emollient and reach high double-digit levels; across consumer-available products the highest observed use is about 20–25% in oil-rich leave-on systems, while rinse-off products typically sit in the low single digits due to wash-off and cost considerations. No specific FDA/EU maximum concentration limit is generally set for triheptanoin in cosmetics beyond overall product safety.