Serums are frequently marketed around one highlighted ingredient or percentage. That makes them easy to compare at first glance, but it can also hide important differences in supporting ingredients, solvents, texture, bottle size and packaging.
Start with what is actually quantified
If a brand prints “10% niacinamide”, “2% alpha arbutin” or another percentage on the label, that is a specific concentration claim by the manufacturer. If no percentage is disclosed, the ingredient list alone generally does not let you calculate an exact percentage.
Read the full INCI list
A serum can contain water, glycols, humectants, polymers, emulsifiers, preservatives and many other supporting ingredients in addition to the highlighted ingredient. Compare the whole label rather than treating one highlighted ingredient as the complete formula.
Check the pack architecture
| Pack format | What to record |
|---|---|
| Dropper bottle | Material, volume, dropper design, opaque/clear packaging |
| Pump bottle | Volume, airless claim if stated, dose mechanism |
| Tube | Net quantity, nozzle design, opaque/transparent pack |
Compare the real unit cost
Serums commonly come in 15 ml, 30 ml, 50 ml or 60 ml packs. Convert the current selling price to a price-per-ml figure before comparing value. A larger pack can have a lower unit cost, but that is a value fact rather than a product recommendation.
Declared concentration, ingredient list, pack size, current listed price, price per ml, bottle/tube type, country of origin where stated, manufacturer/importer and the exact wording of material product claims.
Do not turn label order into a concentration calculator
Ingredient order has rules, but the 1% threshold means ingredients at or below that level may not appear in strict descending order. Exact percentage estimates based only on list position can therefore be misleading.
Frequently asked questions
Is a higher percentage automatically a stronger or better serum?
The percentage is a measurable formulation claim, but “better” is an evaluative conclusion that cannot be derived from that number alone.
Can two 10% serums have different formulas?
Yes. Supporting ingredients, solvents, thickeners, preservatives, pH and packaging can differ even when the highlighted percentage is the same.
Why does pack size matter?
Because two products with similar sticker prices can have materially different prices per ml.
Sources and reference framework
DermaQA uses primary or official references where practical. Product formulas and labels can change, so the current pack and manufacturer page remain the most direct references for a specific product.
Last checked: 19 September 2026. This page explains product information and label terminology; it does not provide personalised medical advice or a product recommendation.