Comment by TeMPOraL
2 days ago
There's always a continuity there ("the dose makes the poison"), there's no known substance that will reliably kill you if you're exposed to a single molecule of it.
The issue with potency is that the more potent a substance, the more precise equipment and quality control you need to stay on the safe side. With fentanyl, healthcare and pharmaceutical industry can handle the precision and QC demands (which includes guarantees and maintaining public trust). Criminal enterprises cannot.
Carfentanil has got to be closer to that. It is said to be up to 100x more powerful than fentanyl.
Micrograms (yes still many molecules) could be lethal
1.53 × 10¹⁵ molecules per 1mcg. Which is 15 orders of magnitude larger than a single molecule. If 2mg of fentanyl is considered potentially lethal that would place carfentanyl at 20mcg, though I’ve heard conflicting reports on potency with some placing it at 10x not 100x. So roughly 16-17 orders of magnitudes.
I don’t take fentanyl but I regularly take signaling peptides where the doses are typically in the mcg range and still rather potent - though with signaling peptides the response curve typically flattens out so bigger doses don’t necessarily mean stronger effects - they can be saturated. Depends on what you’re signaling though.
I had correctly predicted my hypersensitivity to semaglutide (ozempic) so started using it for treating autoimmune issues at a dose of 25mcg and I still ended up with temporary gastroparesis.
prions perhaps?
Even with prions, there evidence that the body (and probably more so with some people than others) has some level of ability to resist, slow, or sometimes prevent a prion infection.
See these:
- The influence of PRNP polymorphisms on human prion disease susceptibility: an update [1]
- A naturally occurring variant of the human prion protein completely prevents prion disease | Nature [2]
[1] https://pubmed.ncbi.nlm.nih.gov/26022925/
[2] https://www.nature.com/articles/nature14510?utm_source=chatg...