The short version of the science—so you know exactly what’s happening under the surface.
Rosemary oil has been shown to stimulate blood circulation in the scalp, ensuring hair follicles receive more oxygen and nutrients. In a 2015 clinical trial, rosemary oil performed as effectively as 2% minoxidil for hair regrowth after six months, but with fewer side effects like itching. By improving scalp microcirculation and reducing inflammation, rosemary oil helps create the ideal environment for stronger, healthier hair to grow.
Rosemary oil reduces inflammatory markers such as TNF-α and IL-6, which are linked to follicle damage and scalp irritation. Research shows its antioxidant rosmarinic acid calms oxidative stress and protects cellular membranes from breakdown. By lowering inflammation and oxidative stress simultaneously, rosemary oil creates a balanced scalp environment that supports stronger follicle anchoring and reduces the risk of shedding over time.
Rosemary oil is rich in antioxidants like carnosic acid and rosmarinic acid, which help neutralize free radicals that damage hair follicle cells. By lowering oxidative stress, it supports DNA integrity and protein repair, strengthening follicles at the cellular level. Research shows this antioxidant effect helps maintain healthier, more resilient hair over time.
One of the main causes of hair thinning is dihydrotestosterone (DHT), a hormone that shrinks follicles over time. Studies show rosemary oil can inhibit the 5-alpha-reductase enzyme, which is responsible for converting testosterone into DHT. By lowering DHT activity directly at the follicle level, rosemary oil helps preserve hair density, slow recession, and protect against long-term miniaturization that leads to thinning or baldness.
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