How many units of Botox do you need? Units by area

A Botox unit is a measure of potency, and it belongs to that one product.

Botox Cosmetic comes in single-dose 50-unit and 100-unit vials, and the label calls for reconstitution with preservative-free saline to 4 units per 0.1 mL.

Every US botulinum toxin label states that its units cannot be compared to or converted into the units of any other botulinum toxin product, and the Botox Cosmetic and Dysport labels say so outright.

That is why no official conversion between brands exists.

The ratios you may have seen, such as 1 Botox unit to 2.5 or 3 Dysport units, come from a 2016 systematic review of head-to-head trials in movement disorders, not from any label.

For the same frown-line area, the labels themselves give 20 units of Botox Cosmetic, 50 units of Dysport, 40 units of Daxxify and 20 units of Xeomin: different numbers on different scales, not a bigger and a smaller dose of the same thing.

Every label dose below is in Botox Cosmetic units.

For the product itself, start with the Botox guide.

For frown lines — the 11s between the eyebrows — the labeled dose is 20 units: 4 units into each of 5 sites, 2 in each corrugator muscle and 1 in the procerus.

For crow's feet it is 24 units in total, 12 units per side, given as 4 units into each of 3 sites per eye.

The forehead is the one upper-face area the label does not dose on its own: forehead lines are treated together with the frown lines, 20 units to the forehead plus 20 units to the glabella, 40 units in total.

The label gives no forehead-only dose.

Treated in combination, the label totals are 44 units for frown lines plus crow's feet, and 64 units for forehead lines, frown lines and crow's feet in one session.

Those are the combination totals the label gives.

Neck bands carry their own labeled dose (below); any other cosmetic area treated in the same appointment is off-label, with no label dose at all.

The label doses at a glance:

Dose also shapes duration.

In a 64-week study of 363 people, a 20-unit frown-line dose lasted a mean of 17.1 weeks, against 14.8 weeks for 10 units.

That trial is the best evidence we found that cutting the dose shortens how long results last, and it tested frown lines only.

Three of these four are off-label.

No current US label for any botulinum toxin covers a brow lift, a lip flip or masseter jaw slimming; Botox Cosmetic's only approved areas are frown lines, crow's feet, forehead lines and platysma bands.

For area-by-area detail on and off the label, see our Botox areas guide.

The neck is the exception.

Botox Cosmetic is FDA-approved for moderate to severe platysma bands — the vertical bands — an approval from October 18, 2024 that made it the only US toxin currently labeled for neck bands, and its label gives 26, 31 or 36 units depending on how many bands are present (1 or 2 per side).

For a chemical brow lift, we could not find a label, consensus statement or high-quality study that gives a unit range, and the same is true for the other spot treatments: bunny lines, the corners of the mouth (DAO), the chin and jowl or 'Nefertiti' work.

These doses are decided injector by injector.

The lip flip also runs on study numbers, not a label dose.

A 2025 systematic review of 7 studies (selected from 48 screened) reported that the treatment typically uses 4 to 6 units of botulinum toxin injected into the orbicularis oris, the muscle around the mouth, to evert the upper lip without adding volume.

Treating a gummy smile is also off-label, and its published figures come from studies rather than a label: a 2023 meta-analysis reported 1.25 to 7.5 units per side into the lip-elevator muscles, with gum exposure reduced by up to 6 mm at 12 weeks.

Masseter (jaw-slimming) doses are the largest here, and they come from trials, not a label.

In AbbVie's phase 3 trial, 376 adults with marked or very marked masseter prominence received 72 units of onabotulinumtoxinA, and 51.2% achieved at least a 2-grade improvement at day 90, versus 2.2% on placebo; lower-face width shrank by a mean of 5.24 mm versus 0.04 mm, with improvements sustained through day 180.

An earlier 12-month phase 2 study tested 24 to 96 units in 187 adults and saw no clinically relevant changes in the jawbone or teeth, though a localized effect on the smile was reported with the 96-unit dose in 4 subjects.

A 2026 meta-analysis of 5 randomized placebo-controlled trials found benefit in 48-unit and 72-unit regimens but concluded the evidence is not sufficient to define an optimal dose or protocol.

At the labeled 20-unit frown-line dose, men responded less often than women in Botox Cosmetic's trials: an exploratory analysis of the day-30 investigator assessments found 85% of 334 women responding, versus 59% of 71 men, and responses also appeared lower in people 65 and older.

The label does not go further than that — it sets no separate dose for men.

There is trial evidence behind larger doses for men, from above the label dose.

In a 2005 dose-ranging trial of 80 men, 40, 60 and 80 units to the glabella were consistently more effective than 20 units, with dose-dependent increases in response rate and duration and no increase in adverse events; the authors concluded that men benefit from starting doses of at least 40 units.

Keep that finding in its frame: it is one trial in 80 men, testing doses above the labeled 20 units.

Whether more units make sense for you is a question for a licensed provider who can examine the muscle being treated.

Botox is typically priced per unit or per treatment area, and the label doses put a floor under each area's count: 20 units for frown lines, 24 for crow's feet, 40 for forehead lines treated with the frown area.

At a per-unit price, an area costs roughly its units times that price, so every additional area adds its own units to the bill.

Comparing quotes takes care for two reasons.

Because units are product-specific, a per-unit price does not travel between brands: Dysport's labeled frown-line dose is 50 units where Botox Cosmetic's is 20, so a lower per-unit number is not automatically a lower cost for the same area.

And with per-area pricing the unit count stops being the headline, though it still decides how much product the provider draws up.

We do not quote a national average here: we could not confirm a current national average fee for Botox, and prices differ by practice and location.

What drives a Botox bill, and how to read a per-unit versus per-area quote, is covered in our Botox cost guide.