I did read off a link from one of the other threads that natural \'nol oxidizes quickly once released from the apocrine glands and on the skin with bacteria and oxygen. I\'m a bit skeptical of that conclusion but it would suggest either spraying on one\'s clothes or using an oil-base for \'nol products.
The manufacturer\'s formulation will have considerable influence on bottle shelf life since they could use amber bottles, add anti-oxidants, and perhaps other tricks. However, I\'m not at all sure that the suppliers are motivated to pay too much attention to that aspect of product development though. It would be nice to see an expiry date on each bottle.
One could speculate that the end user can extend a bottle\'s useful life by storing it in the refrigerator, cold and away from the light.
For fine perfumes, it is common knowledge that one should buy only small quantities as the more volatile consistuents will escape and others are unstable. I think that\'s good advice for pheromone products too.
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