Our testing notes.
Estratetraenol is the female-produced putative the community ties to a warmer, more protective and romantic mood in heterosexual men. Pheromone Treasures sells it pure: unscented, 1mg/ml, in a 10ml dropper.
As one molecule, the effect is subtle and specific, a soft, feminine-coded signal to layer into a blend rather than a dramatic attraction switch. DIY mixers and women building their own scents use it to add warmth and a romantic edge.
With clear labeling and fair pricing, it's a sensible building block from a credible brand. If you want something to wear, choose a finished blend like Captain For Her, which already includes it.

