Myristyl Nicotinate

Myristyl nicotinate is a nicotinic acid (niacin) ester used as a rubefacient/vasodilating skin-conditioning agent in topical products, typically at low percentages but specifically to induce increased blood flow and a warming/flushing effect. Clinically, nicotinate esters are well known to cause transient erythema, stinging, and burning—effects that are amplified in eczema-prone or barrier-impaired skin and can be mistaken for “irritation” because they are irritation by mechanism. Given its intentional vasodilatory activity and frequent reports of noticeable warmth/redness even at typical cosmetic use levels, I score it high for irritancy risk in sensitive populations. Safety Notes: Myristyl nicotinate is primarily used as a rubefacient/microcirculation-boosting nicotinic acid ester in leave-on body/leg “warming,” anti-cellulite, and massage products, where it is often present at very low levels (~0.01–0.1%) to provide a mild sensory effect while limiting flushing. In higher-intensity OTC slimming/firming and heat-activating formulations, concentrations commonly move into the 0.5–2% range, with a small number of consumer-available specialty products/formula concepts reaching about 5% to deliver a pronounced warming/tingling effect. Use above this level is uncommon in mass-market skincare due to irritation/flush potential and diminishing formulation practicality; rinse-off products typically use lower levels than leave-on products because the sensory benefit is reduced by short contact time.