Quick answer: typical unit ranges
Every face is different — muscle size, gender, age and the goal all move the number — but the ranges commonly quoted for the original Botox (onabotulinumtoxinA) scale are roughly:
- Frown lines (between the brows) — often around 20 units
- Forehead lines — commonly around 10–20 units
- Crow's feet — commonly around 10–24 units total for both sides
- Jaw slimming (masseter) — often 20–30+ units per side, more for bulky muscles
- Underarm sweating — substantially more, commonly 50 units per side
Treat these as orientation, not prescription — the real number should come from a doctor assessing your muscles, and it is normal for it to differ from these ranges in either direction.
What a "unit" actually is
A unit is a measure of the toxin's biological activity — how much muscle-relaxing effect it delivers — not a volume. The clinic dilutes the powdered toxin with saline before injecting, so the same 20 units can arrive in a bigger or smaller liquid volume depending on the dilution. This is why "cc" or "syringes" tell you nothing about Botox dose, and why a clinic that quotes toxin in cc rather than units is already being vague about the thing that matters.
Why brand units are not interchangeable
Units are calibrated per brand. Botox (Allergan), Xeomin (Merz) and the Korean brands use scales that are roughly comparable to each other, but Dysport uses its own scale — a Dysport treatment involves numerically more units for the same effect, commonly quoted at around 2.5–3 Dysport units per Botox unit. So "300 units" of Dysport is not a bigger treatment than "100 units" of Botox; it may be the same dose in a different currency.
The practical rule: never compare unit counts across brands, and never compare prices per unit without the brand attached. Our Thai FDA brand list covers which botulinum toxins are legally registered here.
Commonly quoted ranges by area
Why do areas differ so much? Because doses follow muscle mass. The frown complex is a strong knot of muscle and gets a fairly standard dose; the forehead muscle is broad but thin, so it takes less than people expect — and overdosing it is what drops brows. The masseter is the biggest muscle on the list, which is why jaw slimming uses the most facial units and takes longest to show. Sweating treatments use big numbers because the target is a wide area of skin, not one muscle.
Men typically need more units than women for the same area — stronger muscles — and a first session is often dosed conservatively, then reviewed at two weeks. A doctor who suggests fewer units than you asked for, with a top-up plan, is usually the one dosing honestly.
Dose, duration and the "frozen" look
Within a sensible range, more units means a stronger and usually longer-lasting effect; very low doses wear off faster. That tempts people toward big doses — but the natural look lives in the middle: enough to soften the movement that bothers you, not enough to erase expression. The "frozen" look is not a brand problem or a fake-product problem; it is simply too many units in the wrong pattern.
If your result fades unusually fast every time, don't just buy more units — first question the product's authenticity and dilution, and read our guide to Botox resistance, because "more units, more often" is exactly the pattern that raises that risk.
Why "unlimited units" misleads
"Unlimited units" sounds generous, but think about the economics: genuine toxin is priced per vial, so an unlimited offer only works if the dilution, the total dose, or the product itself is not what you assume. The same goes for per-area package prices with no unit number attached — you cannot tell whether you are comparing a 15-unit forehead with a 25-unit one. The honest ask is simple: brand, unit count per area, and the price for those units. Only two of the ten Botox clinics we reviewed publish both brand and per-unit price — that gap is exactly where confusion lives.
Questions to ask the clinic
- Which brand, and how many units for each area?
- Is that this brand's unit scale? (Especially if it's Dysport)
- What dilution do you use, and who decides the injection pattern?
- What happens at the two-week review if the result is uneven?
- Is a top-up included, and at what dose?
Pair these with the authenticity checks in our fake Botox checklist — a unit count only means something if the vial is real.
The bottom line
Units are the currency of Botox — a measure of effect, calibrated per brand, spent according to your muscles. Use the common ranges as orientation, insist on brand + units + price together, be suspicious of "unlimited", and let a doctor's assessment set the final number. Comparing clinics without units is comparing blind.