Stimulating gels are an underrated category in sexual wellness. They're often dismissed as novelty items, something for couples to try, nothing serious. But the active ingredient behind the most effective stimulating gels, menthol, is anything but a trick. It is a molecule with a well-documented mechanism, a specific receptor target, and measurable effects on genital blood flow.
This guide explains how it works. Not as marketing copy, as biochemistry.
What Is Menthol and Why Is It in Stimulating Gel?
Menthol is a terpenoid, an organic compound found in peppermint and other mint species. It is one of the most studied skin-active molecules: it creates a cooling sensation without actually cooling the skin, and it does this via a specific receptor mechanism.
In sexual stimulating gels, menthol is used because this cooling sensation on genital tissue is experienced differently than on the rest of the skin: it activates a cascade of physiological responses that many users describe as tingling, warming, and heightened sensitivity.
TRPM8 Receptors: The Scientific Basis
TRPM8 stands for Transient Receptor Potential Melastatin 8, a class of ion channels present in sensory nerve fibers and vascular smooth muscle cells. They are "cold-sensitive": they are activated at temperatures below 28°C, and also by menthol.
When menthol activates TRPM8 receptors:
1. Sensory activation: nerve fibers innervating the skin transmit a cold/tingling signal to the central nervous system. This increases local sensory attention.
2. Vascular response: TRPM8 activation in smooth muscle cells of blood vessels causes relaxation of those muscles, producing vasodilation (widening of blood vessels).
Menthol-induced activation of TRPM8 receptors significantly increases cutaneous blood flow, according to research published in Microvascular Research (2021).
Menthol and Genital Blood Flow: What Does Research Show?
This is the part that most stimulating gel brands don't mention, because the research is relatively recent and specific.
A study published in the Canadian Journal of Physiology and Pharmacology (2025) investigated sex-specific vascular effects of menthol on the pudendal artery, the artery primarily responsible for genital blood supply in both men and women.
The findings:
- Menthol induces relaxation of the pudendal artery via TRPM8 and TRPA1 activation (two different ion channel classes)
- The female tissue response is stronger: menthol-induced relaxation of the pudendal artery was greater and more reliable in female tissue than in male tissue
- In women, the effect depends on both receptor types; in men, the response is weaker and less consistent
What does this mean in practice? For women using a stimulating gel on the clitoris, menthol produces a measurable increase in local blood flow, which physiologically explains the tingling and heightened sensitivity. It is not a placebo.
For Men and Couples
There is also research on menthol as a topical agent in erection-related vascular issues. Menthol-induced TRPM8 activation improves the reactivity of vascular tissue in the penis, according to research in Hypertension (2024). The effects are less consistent than in women, but present.
Safety and pH: What You Need to Know
Not all stimulating gels are equal. And this is where things often go wrong.
Poor formulas contain:
- Alcohol (dries out the mucous membrane, disrupts pH)
- Fragrance or synthetic scents (irritating to vaginal tissue)
- High concentrations of propylene glycol (can disturb pH balance)
- Menthol in excessively high concentrations (burning rather than tingling)
Good formulas are:
- Water-based
- pH-balanced (vaginal tissue has a pH of 3.8-4.5; the product should fall within that range)
- Made with food-grade or cosmetic-grade menthol
- Free from alcohol and fragrance
The Aia* Stimulating Gel contains food-grade menthol in a light water-based base. The product is designed for clitoral application, precisely where TRPM8 receptor density in genital tissue is highest.
How and When Do You Use a Stimulating Gel?
Where: On and around the clitoris, for women. For men: on the penis, specifically on the glans and frenulum. Not internally: stimulating gels are not designed for vaginal or anal insertion.
When: Before or during sexual activity. The effect builds over 30-90 seconds and lasts 15-30 minutes. It works best when tissue is already somewhat aroused (more blood flow = more receptor activation).
How much: Less than you think. Start with a small amount (pea-sized application) and assess the effect. More can produce a more intense, but sometimes too intense, sensation.
In combination with lubricant: Always use the gel in combination with or after a water-based lubricant for penetrative use. Not as a replacement for lubricant.
Common Mistakes
- Applying too much. A small amount produces tingling pleasure; too much can cause a burning sensation. Start conservatively.
- Internal application. Stimulating gels are not designed for internal use. Apply only externally.
- Expecting it to work as lubricant. It is not a lubricant. Always combine with a lubricant if penetration is involved.
- Buying a product with alcohol or fragrance. Read the ingredient list. Alcohol and fragrance do not belong in a genital product.
Frequently Asked Questions
Is a stimulating gel the same as an arousal gel or serum?
Essentially yes, the terminology varies by brand, but the active ingredient (menthol or sometimes L-arginine) is comparable. Look at the ingredients, not the name.
Can I use a stimulating gel with a vibrator?
Yes. Combining gel and vibrator often works well: the gel increases local sensitivity, the vibrator provides direct stimulation. Ensure the gel is water-based so it doesn't damage the toy.
Is this also for men?
Yes, the mechanism is present, although the genital vascular response in women is stronger. Men can apply the gel to the glans and frenulum for a light tingling effect.
The Verdict
Menthol in stimulating gel is not a marketing trick. It is vascular pharmacology. TRPM8 receptor activation, pudendal artery relaxation, increased local blood flow: the mechanisms are documented and measurable.
The Aia* Stimulating Gel is a water-based, pH-balanced formula with food-grade menthol, designed for clitoral application. Pair with the Aia* Lubricant for a complete sexual wellness routine.
Also read our complete lubricant guide for more on the science behind sexual lubrication. Browse the full Lubricants & Oils collection for our complete range.
Sources:
1. Parenti A. et al. (2021). Menthol-induced activation of TRPM8 receptors increases cutaneous blood flow across the dermatome. Microvascular Research. ScienceDirect
2. Tanguay A.R. et al. (2025). Sex-specific vascular effects of menthol: TRPM8- and TRPA1-dependent relaxation in female mouse aorta and pudendal arteries. Canadian Journal of Physiology and Pharmacology. NRC
3. Hernandez-Iglesias R. et al. (2024). Beyond cooling sensation: topical penile administration of the TRPM8 agonist improves hypertension-associated erectile dysfunction. Hypertension. AHA
