Botulinum Toxin Potency Explained: Botox vs Dysport vs Xeomin vs Jeuveau vs Letybo vs Daxxify

Botulinum toxin treatments are not all the same, even when they are used for similar aesthetic goals such as softening frown lines, forehead lines, or crow’s feet. The most important scientific point is that botulinum toxin products use different unit systems, so their labeled units are not interchangeable across brands.accessdata.fda+1

That means a chart showing nanograms, units, or vial size can be informative, but it cannot by itself prove that one product is universally stronger than another.pmc.ncbi.nlm.nih+1

What Botulinum Toxin Does

Botulinum toxin type A works by blocking acetylcholine release at the neuromuscular junction, which temporarily reduces muscle activity. This is why it is used in both medical and cosmetic care, including treatment of glabellar lines, cervical dystonia, spasticity, chronic migraine, and hyperhidrosis.pmc.ncbi.nlm.nih+3

In aesthetics, the goal is usually to reduce dynamic wrinkles while preserving natural facial expression.pmc.ncbi.nlm.nih

Why Brands Differ

Botulinum toxin brands differ in manufacturing, purification, accessory proteins, and assay methodology. Some products contain the 150 kDa active neurotoxin in different formulations, while others have varying amounts of complexing proteins or different excipients.pmc.ncbi.nlm.nih+3

Because of these differences, a labeled “unit” on one product does not equal a labeled “unit” on another product.accessdata.fda+1

What “ng” Means

Nanograms (ng) measure mass, not clinical effect. In a comparative analysis, the reported neurotoxin load per 100 units was approximately 0.73 ng for Botox, 0.65 ng for Dysport, and 0.44 ng for Xeomin.pmc.ncbi.nlm.nih+1

The same paper reported specific activity values of 137 U/ng for Botox, 154 U/ng for Dysport, and 227 U/ng for Xeomin. These numbers are useful for understanding formulation differences, but they do not provide a universal clinical ranking.pmc.ncbi.nlm.nih+1

Comparison Table

ProductReported neurotoxin contentReported specific activityImportant noteBotox (onabotulinumtoxinA)0.73 ng per 100 U pmc.ncbi.nlm.nih137 U/ng pmc.ncbi.nlm.nihUnits are product-specific and not interchangeable accessdata.fda+1.Dysport (abobotulinumtoxinA)0.65 ng per 100 U pmc.ncbi.nlm.nih154 U/ng pmc.ncbi.nlm.nihOften used at a different unit scale than Botox pmc.ncbi.nlm.nih+1.Xeomin (incobotulinumtoxinA)0.44 ng per 100 U pmc.ncbi.nlm.nih227 U/ng pmc.ncbi.nlm.nihOften described as highly purified and free of accessory proteins pubmed.ncbi.nlm.nih.Jeuveau (prabotulinumtoxinA)Not consistently established in the same comparative datasetNot consistently established in the same comparative datasetFDA labeling should guide use; cross-brand equivalence is not direct accessdata.fda.Letybo (letibotulinumtoxinA)Not consistently established in the same comparative datasetNot consistently established in the same comparative datasetTreat as a distinct product with its own dosing system accessdata.fda.Daxxify (daxibotulinumtoxinA)Not consistently established in the same comparative datasetNot consistently established in the same comparative datasetFDA labeling states units are not interchangeable accessdata.fda.

How to Interpret Potency

If one product has more nanograms per vial, that does not automatically mean it is more clinically potent. Potency depends on the assay, the product formulation, and the clinical endpoint being studied.pmc.ncbi.nlm.nih+3

In the literature, Botox and Dysport have shown different dose-conversion relationships depending on the indication, and published conversion ratios have ranged widely.pmc.ncbi.nlm.nih+2

Dose Conversion and Clinical Interpretation

Botulinum toxin products cannot be compared by labeled units alone because each brand uses its own assay and unit definition. In clinical practice, injectors sometimes use approximate conversion ratios to move between products, but these ratios are only practical guides and do not mean the products are truly interchangeable.foundationdystoniaresearch+3

For Botox and Dysport, published conversion ratios have varied across studies and indications, ranging from about 1.7:1 to 4:1, with some reviews suggesting that 3:1 or even lower may be appropriate in certain settings.pubmed.ncbi.nlm.nih+2

Using a 2.7:1 Dysport:Botox ratio, 300 units of Dysport would correspond to roughly 111 units of Botox for dose-planning purposes. That calculation is useful for clinical translation, but it should not be interpreted as proof that the two products have identical biologic potency or identical clinical behavior.pubmed.ncbi.nlm.nih+3

What Consumers Should Know

For patients, the most important decision is not which product has the biggest number on a chart. It is which product best fits the treatment goal, the anatomy being treated, and the injector’s dosing strategy.pubmed.ncbi.nlm.nih+2

Daxxify is often discussed for its longer duration, while Botox, Dysport, and Xeomin have the deepest comparative literature in many clinical areas.fda+2

Local Treatment Considerations

If you are seeking botulinum toxin treatment in Northridge, Simi Valley, Thousand Oaks, Westlake Village, Tarzana, Encino, Granada Hills, Santa Clarita, Ventura, Oxnard, or Camarillo, the same scientific principles apply: the best product is the one selected appropriately for the patient and injected with accurate technique.thecitiesnow+1

A reputable medspa should explain product differences clearly, avoid claiming universal unit equivalence, and personalize treatment rather than using a one-size-fits-all approach.pmc.ncbi.nlm.nih+1

FAQ

Is Botox stronger than Dysport?

Not in a simple universal way. Botox and Dysport use different unit systems, so their labels cannot be compared directly.accessdata.fda+1

Why does Dysport have more units than Botox?

Because Dysport and Botox are measured using different product-specific assays. More labeled units do not automatically mean more potency.pubmed.ncbi.nlm.nih+1

Which botulinum toxin has the highest specific activity?

In the comparative review cited here, Xeomin showed the highest specific activity at 227 U/ng, followed by Dysport at 154 U/ng and Botox at 137 U/ng.pmc.ncbi.nlm.nih

Does a lower ng number mean a weaker product?

No. Nanograms measure mass, not clinical performance. The effect depends on formulation, dosing, and the treatment area.pmc.ncbi.nlm.nih+1

Are Daxxify, Jeuveau, and Letybo interchangeable with Botox?

No. FDA labeling states that botulinum toxin units are not interchangeable across products.accessdata.fda

How long does Daxxify last compared with Botox?

Daxxify is commonly discussed as having a longer duration in clinical studies, but duration still varies by patient and treatment area.lesliebaumannmd+1

What is the best botulinum toxin for me?

That depends on your goals, the area being treated, your anatomy, and your injector’s experience. A consultation is the best way to choose the right product.