How Botox works
Botox is the trade name for botulinum toxin type A, a protein obtained from the bacterium Clostridium botulinum.
Its mechanism of action can be described in three steps:
1. attachment to the nerve cell
Botox binds specifically to nerve endings that are responsible for transmitting signals to muscles.
Blockade of signal transmission
The nerve normally releases the messenger substance acetylcholine, which tells the muscle: “Contract!”.
Botox cleaves an important transport protein (SNAP-25) and thus prevents acetylcholine from being released.
Consequence
The muscle no longer receives a “contraction command” – it relaxes.
This lasts until the nerve has formed new endings (usually 3-6 months).
2. how Botox is broken down in the body (metabolization)
Botox does not travel far: it remains locally bound to the injected nerve cells.
Protein breakdown: As it is a protein, it is gradually broken down into small peptide pieces and amino acids by the body’s own enzymes.
Recycling: The body can use these amino acids again to build up other proteins.
No “classic” liver or kidney degradation: Unlike drugs, Botox is not first passed into the blood to be “detoxified” there – the degradation mainly takes place directly in the nerve cells and in the surrounding tissue.
3. does body temperature have an influence?
Normal fluctuations (36-38 °C) have no noticeable influence on the effect or shelf life of Botox in the body.
Extreme temperatures (e.g. high fever, severe hypothermia) could theoretically change the metabolism in the cells, which influences the regeneration of nerve endings – in practice, however, this effect is hardly clinically relevant.
More important is the temperature during storage before injection: Botox must be cooled, as it loses its protein structure at room temperature or heat and becomes ineffective.
In short:
Botox locally blocks the release of acetylcholine, is then enzymatically broken down into its protein building blocks and leaves the body not as “poison” but as normal amino acids. Your body temperature in everyday life changes virtually nothing.