Methoxyestratetraenol (MEO-EST)

Methoxyestratetraenol — MEO-EST to the community — is estratetraenol with its 3-hydroxyl capped as a methyl ether. Despite the “-ol” in the community name, there is no free hydroxyl left; the correct chemical name is 3-methoxyestra-1,3,5(10),16-tetraene. It is one of the better-liked modern pheromone additives, sold as a “social buffer,” and it has a real CAS — which not every estratetraene on this list can claim.

What it is, structurally

Methoxyestratetraenol is 3-methoxyestra-1,3,5(10),16-tetraene: the methyl ether of estratetraenol , with a methoxy group where the parent has a hydroxyl. Molecular formula C19H24O. The “-ol” in the popular name is a misnomer — methylation removes the alcohol — which is worth knowing, because it is the key to how the molecule behaves compared with the acetate ester.

CAS number and chemistry

The CAS Registry Number for methoxyestratetraenol (estratetraenol methyl ether) is 28336-31-4. PubChem CID 251117, molecular formula C19H24O, molar mass 268.4 g/mol, systematic name 3-methoxyestra-1,3,5(10),16-tetraene. A firm, registered identity — a useful contrast with its ketone cousin, whose identity is genuinely disputed.

Why it isn't just an estratetraenol prodrug

This is the crucial chemistry point. Unlike estratetraenol-acetate , a methyl ether is not readily cleaved back to the parent alcohol by skin enzymes. So methoxyestratetraenol does not simply “become estratetraenol” on the skin — if it has an effect, it most likely acts as its own molecule. That is why it deserves a separate page rather than being treated as a delivery form of estratetraenol.

What wearers report

MEO-EST is one of the more consistently praised modern additives: the community describes it as a “social buffer” that creates steady comfort and rapport without pushing a wearer into a romantic-rejection (“friendzone”) read. Those are field reports, not trials, but the profile is specific and repeated enough that it has become a staple ingredient rather than a curiosity.

Mechanism and a real caution

The mechanism is not established — it may have its own weak signalling activity distinct from estratetraenol's. There is also a genuine caveat worth stating: as a methoxy estratetraene it can carry estrogenic character, and community guidance is to apply it to clothing rather than directly to skin to limit absorption. That is a sensible, honest precaution for any estrogen-adjacent molecule, and it belongs on the page rather than buried.

Does any pheromone product use it?

Yes — methoxyestratetraenol appears in a range of modern women's and unisex “social” blends, often as the comfort/rapport layer beneath more attention-grabbing molecules. Our best pheromone perfumes for women roundup covers products in this category.

The honest read

Methoxyestratetraenol is a well-identified methyl ether of the female-signal molecule with a real CAS, a consistent community reputation as a social buffer, and an unproven mechanism plus a sensible estrogenic-exposure caution. One of the better-founded modern additives on reputation, still short of controlled evidence — wear it as a comfort note, on clothing, with realistic expectations.

How to use it, and the clothing rule

The community's own guidance is the responsible starting point: because methoxyestratetraenol can carry estrogenic character, apply it to clothing rather than directly to skin, and use small amounts. As a “social buffer” it is treated as a background comfort layer rather than a headline attractant, so a little goes a long way and there is no reason to over-apply an estrogen-adjacent molecule.

It is usually worn as part of a blend rather than solo, sitting beneath more attention-grabbing molecules to smooth the overall social read. If you are building or buying a women's or unisex “social” formula, this is often the comfort/rapport note doing quiet work in the background — the finished products are covered in our best pheromone perfumes for women roundup.

FAQ

What is methoxyestratetraenol?

The methyl ether of estratetraenol, 3-methoxyestra-1,3,5(10),16-tetraene (CAS 28336-31-4), sold as the “social buffer” MEO-EST.

Does it turn into estratetraenol on skin?

No — unlike estratetraenol-acetate , a methyl ether is not readily cleaved back to the alcohol, so it acts as its own molecule.

Is methoxyestratetraenol safe on skin?

Because it can carry estrogenic character, community guidance is to apply it to clothing rather than skin. That is a reasonable precaution for an estrogen-adjacent molecule.

Where should you apply methoxyestratetraenol?

On clothing rather than skin, in small amounts, because of its potential estrogenic character. It is a background “social buffer,” so restraint is the right default.

What does 'MEO-EST' stand for?

It is a community abbreviation of methoxy-estratetraenol. The name is a little loose — the molecule is really the methyl ether of estratetraenol , with no free hydroxyl — but MEO-EST is how you will see it sold.

Is methoxyestratetraenol a female-only pheromone?

It descends from estratetraenol , the proposed female signal, but in practice it is used in both women's and unisex “social” blends as a comfort layer. Its reputation is about smoothing a social read rather than projecting a strictly gendered signal, so it is not limited to women's products.

Further reading

PubChem. 3-Methoxyestra-1,3,5(10),16-tetraene, CID 251117 (CAS 28336-31-4).