Androstenetrione

Androstenetrione is the odd one out in this family. Better known as 6-OXO, it is androst-4-ene-3,6,17-trione — a synthetic aromatase inhibitor sold to bodybuilders to block estrogen, not a molecule anyone sprays on to send a signal. It lands on pheromone lists by name-association with the androstene family, and the honest entry is mostly about clearing that confusion up.

What it is, structurally

Androstenetrione is androst-4-ene-3,6,17-trione: an androstene carrying three ketone groups (at carbons 3, 6 and 17), molecular formula C19H24O3. The 6-keto group is the functional business end — it is what lets the molecule bind and irreversibly inactivate the aromatase enzyme. This is a designed supplement compound, not a component of human body odour.

CAS number and chemistry

The CAS Registry Number for androstenetrione (6-OXO) is 2243-06-3. PubChem CID 150986, molecular formula C19H24O3, molar mass 300.4 g/mol, systematic name androst-4-ene-3,6,17-trione. A firm, registered identity — which, ironically, is clearer than that of several molecules on this list with far stronger pheromone reputations.

What it actually does

Androstenetrione is a suicide (irreversible) aromatase inhibitor: it blocks the enzyme that converts testosterone into estrogen, which is why it was marketed to raise testosterone and lower estrogen in athletes. That is an endocrine, whole-body effect achieved by taking it internally. It is pharmacology, not chemosignalling — a different category of action entirely from the 16-androstene odorants.

Why it isn't really a worn pheromone

There is no chemosignal role for androstenetrione and no meaningful volatile-odorant behaviour of the kind the pheromone research studies. Any “pheromone” positioning is a category slip driven by the shared “androsten-” name. If you want the molecules with an actual worn-signal case, they are the volatile 16-androstenes — androstenone , androstenol , androstadienone — not this aromatase inhibitor.

The honest read

Androstenetrione is a real, well-defined supplement molecule with a clear job — inhibiting aromatase — and that job has nothing to do with wearing a scent to change how others read you. It belongs on a molecule index for completeness and to correct the confusion, not as a pheromone to buy for topical use.

How it ended up on pheromone lists

Androstenetrione's presence here is almost entirely an accident of naming. It shares the “androsten-” prefix with the genuine 16-androstene odorants — androstenone , androstenol — so it gets swept into “androstene family” roundups even though its chemistry and its job are completely different. It is a designed supplement molecule, not a component of sweat.

Regulatory status and safety

6-OXO was sold as a testosterone-boosting supplement in the 2000s and has since run into regulatory trouble in several markets as an unapproved steroid-adjacent agent; it is banned in sport as a hormone-manipulating substance. None of that has any bearing on wearing a scent — but it does mean that anything marketed as a topical “androstenetrione pheromone” is stretching a supplement compound into a role it was never shown to have.

A note on the name (and a common mix-up)

The “6-OXO” label refers to the 6-keto group that lets the molecule inactivate aromatase. It is easy to confuse androstenetrione with androstenedione — the names are a syllable apart — but they are different things: androstenedione is a natural hormone precursor (a dione), while androstenetrione is the synthetic trione aromatase inhibitor. A pheromone product that blurs the two is worth distrusting.

FAQ

Is androstenetrione a pheromone?

No. It is an aromatase-inhibiting supplement (6-OXO, CAS 2243-06-3) taken internally to affect hormone balance, not a worn chemosignal.

What is androstenetrione used for?

As an oral aromatase inhibitor to block testosterone-to-estrogen conversion — a bodybuilding supplement use, now largely superseded and restricted in some markets.

Why is it on a pheromone list?

By name-association with the androstene family. Chemically and functionally it is an endocrine agent, not a pheromone.

Is androstenetrione banned?

It is prohibited in sport as an anti-estrogen/hormone-manipulating agent, and its supplement sale has faced regulatory restriction in some markets. That is a supplement-and-doping issue, separate from any cosmetic use.

Is it safe to wear as a pheromone?

There is no established topical pheromone use to assess. As an aromatase inhibitor its real activity is endocrine and internal, so the honest advice is to treat “androstenetrione pheromone” marketing with skepticism rather than to look for a worn benefit.

Is androstenetrione the same as androstenedione?

No. Androstenedione is a natural testosterone/estrogen precursor; androstenetrione (6-OXO, CAS 2243-06-3) is a synthetic aromatase inhibitor. The similar names cause real confusion, but the molecules and their uses are distinct.

Should androstenetrione be in a pheromone product at all?

Honestly, no. It is an aromatase inhibitor with an internal, endocrine action and no worn-signal evidence, so its appearance in a “pheromone” product is a naming artefact rather than a feature. The molecules that belong there are the volatile 16-androstenes like androstenone .

Was 6-OXO ever a mainstream supplement?

Yes, in the 2000s it was a popular over-the-counter anti-estrogen for lifters, before regulatory pressure and newer agents pushed it aside. That history is why the name still circulates, including on molecule lists where it does not really fit.

Further reading

PubChem. Androst-4-ene-3,6,17-trione, CID 150986 (CAS 2243-06-3).