No, You're Not Imagining It-Here's Why Your Botox Results Aren't Lasting as Long as They Used To
Briefly

Immunogenicity refers to the body's ability to produce an immune response against injectables, which can lead to quicker fading of results and decreased effectiveness.
Dermatologist Saami Khalifian explains that frequent, high doses of neurotoxins over time might cause the body to produce antibodies that neutralize treatment effects.
Read at WhoWhatWear
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