It's possible that you're referring to:
* Homeopathic dilutions: Homeopathy is a system of alternative medicine that uses highly diluted substances, often to the point where there are virtually no molecules of the original substance left. They believe that these dilutions can still have a therapeutic effect. However, there is no scientific evidence to support this claim.
* The concept of hormesis: Hormesis refers to the idea that low doses of a substance that is harmful at higher doses can actually be beneficial. This is a complex and controversial concept, and it's not universally accepted.
* The idea of "threshold dose": In pharmacology, the "threshold dose" refers to the minimum amount of a substance needed to produce a measurable effect.
If you have encountered this term in a specific context, please provide more information so I can help you understand its meaning.
