What is the ruling on conducting Botox sessions to thicken very sparse hair?

It is permissible, according to Islamic law, to use injections for hair thickening if the substance is pure and does not cause significant harm. The fundamental principle regarding medical treatment is permissibility. While Botox is inherently highly toxic, it is used in very small quantities that do not cause harm. Jurists have permitted treatment with poisons if the amount is small and does not pose a risk of death, and if the medicine is generally safe and its benefit is hoped for. Therefore, there is no objection to undergoing Botox sessions for hair thickening, unless the intention is deception or for a woman to display her beauty excessively (tabarruj).