Potash Alum

Hi! Potash Alum and aluminium (used in antiperspirant) are the same things??

I have read somewhere:
"There are two main differences between Potassium Alum (Aluminium potassium sulfate dodecahydrate) and the salts Aluminium Chloride and Aluminium Chlorohydrate which are commonly used in antiperspirants. Potash alum doesn't absorb into the body as it has quite larger molecular mass i.e. 480 daltons while other aluminium salts contain smaller molecules i.e. 250-380 daltons.

I have also read somewhere that all kinds of aluminiums are absorbed by the body. Could you please provide me with authentic information?

Thank you!
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