Here's what it could refer to:
* Hair Botox: This treatment involves injecting a solution of proteins, vitamins, and other nutrients into the hair shaft. It aims to strengthen, smooth, and add shine to the hair.
* Hair Keratin Treatment: This treatment involves applying keratin protein to the hair, which helps to smooth down the cuticles and reduce frizz. It's often referred to as a "Brazilian Blowout."
* Hair Growth Serums: These serums typically contain ingredients like minoxidil, which are designed to stimulate hair growth.
* Hair Color Treatments: Some brands might use "infusion" to describe a specific coloring technique that involves saturating the hair with color.
If you encountered the term "hair infusion" in a specific context, please provide more information so I can assist you better.