Lemongrass has genuine benefits for skin, backed by lab and clinical research showing it fights bacteria, reduces inflammation, and protects against the enzymes that break down collagen and elastin. Most of these benefits come from citral, which makes up roughly 75% of lemongrass essential oil and drives its antioxidant, antimicrobial, and anti-inflammatory effects.
What Makes Lemongrass Work on Skin
Lemongrass essential oil is dominated by two forms of citral: geranial (43%) and neral (32%), with smaller amounts of geraniol (about 6%). Citral is the compound doing most of the heavy lifting. In lab studies on human skin cells, it blocks oxidative stress, calms inflammatory signaling, and reduces the production of molecules that recruit immune cells to sites of irritation. That combination makes it useful for redness, swelling, and general skin reactivity.
When tested on pre-inflamed human skin cells (dermal fibroblasts), lemongrass oil significantly dialed down several markers of inflammation, including proteins involved in immune cell recruitment and blood vessel inflammation. It also reduced tissue-remodeling signals, which suggests it may help prevent the kind of excessive scarring or skin thickening that chronic inflammation can cause.
Antimicrobial and Acne-Fighting Properties
Lemongrass oil is active against a wide range of bacteria, including the species most responsible for acne breakouts. In lab testing, pure lemongrass oil produced a 27 mm inhibition zone against the acne-causing bacterium Cutibacterium acnes, a strong result comparable to conventional treatments. It also showed activity against Staphylococcus aureus (19 mm zone), MRSA (28 mm), and the yeast Candida (26 mm).
This broad-spectrum antimicrobial activity is one reason lemongrass appears in acne-targeted skincare formulations. It doesn’t just target one type of microbe. It works against gram-positive bacteria, gram-negative bacteria, and fungi, which means it can help with the mixed bacterial environment that often makes acne and other skin infections worse. That said, these results come from lab dishes, not from people applying the oil to their faces. Real-world effects depend on concentration, formulation, and how your skin tolerates the oil.
Antioxidant and Anti-Aging Effects
Aging skin loses collagen and elastin, the two structural proteins that keep it firm and bouncy. Enzymes called collagenase and elastase break these proteins down, and their activity increases as you get older. Lemongrass extracts inhibit both.
In one study, lemongrass extracts blocked collagenase activity by 58% to 75% depending on the extraction method. Elastase inhibition ranged from 36% to 61%. For context, ursolic acid, a well-known anti-aging compound used as the positive control, inhibited elastase by about 71%. So the most effective lemongrass extract came within striking distance of a proven benchmark.
Lemongrass also scavenges free radicals, the unstable molecules generated by UV exposure and pollution that damage skin cells. Extracts showed DPPH radical scavenging activity up to 64% and nitric oxide scavenging up to 41%. An aqueous ethanol extract was also shown to reduce reactive oxygen species production, limit lipid damage in cell membranes, and boost the body’s own antioxidant defenses, including superoxide dismutase and glutathione. These are the same protective systems that decline with age and sun exposure.
Benefits for Oily and Acne-Prone Skin
Lemongrass oil has natural astringent properties, meaning it can tighten pores and reduce surface oiliness. For people with oily or combination skin, this translates to a less greasy appearance and a more balanced complexion. Combined with its antibacterial effects, lemongrass is particularly well-suited for oily, breakout-prone skin types. It addresses two problems at once: excess sebum and the bacteria that thrive in it.
How to Use It Safely
Lemongrass essential oil is not phototoxic, which means it won’t cause burns or dark spots when your skin is exposed to sunlight. Citral, its main compound, has been evaluated and found to be non-genotoxic and not photoallergenic. That’s a meaningful advantage over some other popular essential oils like bergamot or certain citrus oils that require sun avoidance after application.
However, lemongrass oil can cause skin irritation or sensitization if used undiluted or at high concentrations. The fragrance industry caps citral content in leave-on body products at 0.6% and in lip products at just 0.032%. Clinical studies have safely used lemongrass oil in body creams at 2% concentration applied twice daily for four weeks, and scalp tonics at 5% to 15% concentrations applied twice daily without serious adverse effects.
For practical use at home:
- Face: Stick to products formulated with lemongrass at low concentrations, or dilute the essential oil to roughly 1% (about 6 drops per ounce of carrier oil). Facial skin is thinner and more reactive than body skin.
- Body: You can go slightly higher, around 2%, which mirrors the concentration used in clinical studies with body creams.
- Patch test first: Apply a small amount of your diluted oil or product to the inside of your forearm and wait 24 hours before using it on larger areas.
What Lemongrass Won’t Do
Most of the impressive numbers cited above come from lab studies on isolated cells or extracted compounds, not from large clinical trials on human volunteers. Lemongrass oil clearly has real biological activity against inflammation, bacteria, and skin-degrading enzymes. But applying a diluted oil to intact skin is different from exposing cells directly to concentrated extracts in a petri dish. The oil has to penetrate the skin barrier, remain stable, and reach the right cells at a high enough concentration to produce the effects seen in the lab.
Lemongrass is best thought of as a useful supporting ingredient rather than a standalone treatment for serious skin conditions like cystic acne, eczema, or deep wrinkles. Where it shines is as a daily-use ingredient for managing oiliness, keeping skin calm, and adding a layer of antioxidant protection, especially in well-formulated products that combine it with complementary ingredients.