Androstadienol

Androstadienol is the quiet one in the pheromone-molecule family. You will almost never see it named on a product label, and it has no behavioural study of its own worth quoting. It matters because it is the chemical parent of the molecules that do get studied: androstadienone , androstenone , and androstenol . If those three are the actors, androstadienol is the raw material they are cut from.

What it is, structurally

Androstadienol is the common name for 5,16-androstadien-3β-ol — a 16-androstene steroid with a hydroxyl group at the 3-position and two double bonds in the ring system (the 5,16-diene). It is found in the sweat of both men and women, secreted by the apocrine glands under the arm. Like the other 16-androstenes, it has no ordinary hormonal action: it does not bind the androgen receptor and drive masculinisation. Its entire biological interest is as an odour precursor and a candidate chemosignal.

There are isomers, and the naming in the pheromone literature is loose. “Androstadienol” is sometimes used for the 4,16-dien-3-ol form and sometimes the 5,16-dien-3β-ol form, and product copy almost never specifies which. That vagueness is one more reason to treat ingredient lists in this category with suspicion rather than take them at face value.

CAS number and chemistry

The CAS Registry Number for 5,16-androstadien-3β-ol is 1224-94-8. Its molecular formula is C19H28O, molar mass 272.4 g/mol, and it is catalogued in PubChem as CID 150900. The systematic name is androsta-5,16-dien-3β-ol. That single-compound CAS is worth stating plainly, because pheromone marketing loves to gesture at “proprietary androstadiene complexes” without ever naming a registry number you could look up. If a product cannot tell you which molecule and which CAS, it is selling you a story, not a formulation.

Where it sits in the pheromone pathway

Androstadienol is upstream. In the skin, enzymes and bacteria oxidise it toward androstadienone, and androstadienone in turn feeds the pool of androstenone and androstenol that give fresh and stale sweat their characteristic musk. This is the actual biochemical reason underarm sweat smells the way it does, and why the same person's sweat smells different once it has sat a while — the precursor pool is being converted step by step.

That precursor role is the honest case for caring about androstadienol at all. It is not that the molecule does something dramatic to another person's brain. It is that it is the reservoir the studied molecules are drawn from.

What the evidence actually says

Very little, directly. There is no androstadienol equivalent of the Wyart fMRI study or the Saxton field study — those were run on androstadienone . Androstadienol itself has been measured and characterised biochemically, but it has not been the subject of the placebo-controlled human behavioural trials its downstream metabolites have. Anyone telling you androstadienol “increases attraction” is quietly borrowing evidence from those metabolites and hoping you do not notice the substitution.

So the honest evidence level is weak — not because a trial came back empty, but because the trial was never run on this specific molecule. That is a real distinction, and it is the one this site keeps making: absence of evidence in an underfunded field is not evidence of absence, but it is not a green light either.

Does androstadienol show up in pheromone products?

Rarely by name. Formulators reach for the finished odorants — androstenone, androstenol, androstadienone — because those are the molecules with the smell and the citations. Androstadienol is more of a biochemistry-textbook entry than a bottle ingredient. When you do see “androstadiene” language on a label, it almost always means androstadienone, the ketone, not this alcohol.

If you are shopping by ingredient, the molecules that actually earn their place in a formula are covered on our androstadienone , androstenone , and androstenol pages. Our best pheromone perfumes for men and best pheromone perfumes for women roundups tag which picks lean on which.

FAQ

What is androstadienol?

A 16-androstene steroid (5,16-androstadien-3β-ol, CAS 1224-94-8) found in human sweat. It is a precursor to the better-known pheromone-candidate molecules rather than a studied signal in its own right.

Is androstadienol a pheromone?

It is a pheromone candidate by association — it sits in the biosynthetic pathway that produces androstadienone and androstenone. But there is no direct human behavioural evidence for androstadienol itself, so treat “androstadienol pheromone” claims as borrowed from its metabolites.

What is the difference between androstadienol and androstadienone?

One functional group. Androstadienol is the alcohol (an -ol, carrying a hydroxyl group); androstadienone is the ketone (an -one). In the skin the alcohol oxidises toward the ketone, and androstadienone is the one with the actual research behind it.

What does androstadienol smell like?

On its own, faint — it is far less odour-active than androstenone or androstenol. Its contribution to body odour is mostly as feedstock for the more pungent molecules it converts into.

Further reading

Gower, D. B., & Ruparelia, B. A. (1993). Olfaction in humans with special reference to odorous 16-androstenes: their occurrence, perception and possible social, psychological and sexual impact. Journal of Endocrinology, 137(2), 167-187.

Wyatt, T. D. (2015). The search for human pheromones: the lost decades and the necessity of returning to first principles. Proceedings of the Royal Society B, 282, 20142994. DOI: 10.1098/rspb.2014.2994

PubChem. 5,16-Androstadien-3β-ol, CID 150900 (CAS 1224-94-8).