TL;DR: A Botox unit is a standardized measurement of botulinum toxin potency. One unit represents the lethal dose for 50% of a population of mice (LD50). In clinical practice, typical aesthetic treatments use 20-60 units total, far below any safety threshold. Units are not directly comparable between brands.
Written by Dr. Waleerat Thaweebanchongsin, over 10 years of specialized experience. Near BTS Ekkamai. Free consultations via LINE @verzo.
Last updated: April 2026
A Botox unit is a standardized measurement of botulinum toxin potency. One unit represents the lethal dose for 50% of a population of mice (LD50). In clinical practice, typical aesthetic treatments use 20-60 units total, far below any safety threshold. Units are not directly comparable between brands.
Forehead lines typically require 16-20 units, distributed across 4-6 injection points. The exact number depends on forehead size, muscle strength, and desired outcome. Men often need more units than women due to stronger musculature.
Crow's feet (lateral canthal lines) typically require 10-14 units per side, or 20-28 units total for both sides. These are injected in 3-4 points per side around the outer eye area.
The glabella area typically requires 6-10 units across the procerus and corrugator muscles. This is often combined with forehead Botox for a balanced result.
Masseter Botox typically requires 30-60 units per side (60-120 units total). The exact dosage depends on muscle size and desired slimming effect. Results develop over 4-8 weeks as the muscle gradually atrophies.
No. Over-treating can create an unnatural "frozen" look. A skilled injector uses the minimum effective dose for natural results. Starting conservatively and adding more at a follow-up visit is a safer approach than over-injecting initially.
Pricing depends on the brand and number of units. At VERZO CLINIC: forehead (16-20u) from 300-500 THB, crow's feet (20-28u) from 400-700 THB, glabella (6-10u) from 100-250 THB, masseter (60-120u) from 1,000-3,000 THB. Exact pricing per brand available during consultation.
A qualified doctor will assess your facial anatomy, muscle strength, and desired outcome before determining units. Ask your doctor to explain their dosage rationale. At VERZO CLINIC, Dr. Waleerat documents the exact units per injection point for full transparency.