Centella asiatica is one of the most requested botanicals in the category and one of the easiest to buy badly. The same plant name covers a whole-leaf extract, a purified triterpene fraction and an isolated single molecule, and the three arrive at different prices with different specifications and different behaviour in a formula.
Most of the disappointment in centella products traces back to that gap: the brief asked for one of the three and the purchase delivered another. This article is about telling them apart before the batch sheet is written.
Three centella materials, three specifications
What appears as centella on an ingredient list can be any of the following, and the INCI name is what tells you which:
- A whole-plant extract. Made by extracting the dried plant with a solvent, usually water and a glycol. Contains everything the solvent pulls out — triterpenes, but also sugars, pigments, salts and plant acids. Cheap, water-soluble, and variable from batch to batch because the plant varies.
- A standardised triterpene fraction. The extract is processed to concentrate the four characteristic triterpenes: asiaticoside, madecassoside, asiatic acid and madecassic acid. Sold with a stated total triterpene content, which is the number that makes it comparable between suppliers.
- An isolated material. Madecassoside on its own, purified to a high assay. The most expensive of the three by a wide margin, and the one with the most predictable behaviour.
The commercial reason all three coexist is that they cost very differently and can be described similarly. The technical reason to care is that they behave differently in a formula — colour, solubility and stability all change.
The whole extract and what standardisation means
An unstandardised extract is not a defined material. Its triterpene content depends on the plant part harvested, the season, the extraction solvent and the drying method, and it will differ from supplier to supplier and batch to batch.
That does not make it a bad ingredient. It makes it an ingredient whose level in the formula means very little on its own, because the as-supplied percentage describes the weight of a mixture rather than the weight of an active.
Standardisation is the fix: the supplier measures the marker compounds and adjusts so that each batch delivers a stated content. Two suppliers quoting the same triterpene percentage are then actually comparable, which they are not when both are selling unstandardised extract at the same inclusion level.
The single most useful question to ask is therefore not which centella, but what the marker is and what the specification guarantees it to be.
Triterpene fractions and the ratio question
Once a material is standardised, the next question is the composition of the fraction. The four triterpenes are not interchangeable, and materials sold under the same trade category can differ substantially in how much of each they contain.
Two consequences follow. The first is that a percentage of total triterpenes does not tell you which triterpene you are getting most of. The second is that the ratio is a legitimate specification point, and a supplier who can state it is a supplier who measured it.
In practice, buyers rarely specify the ratio, which is why it is rarely offered. If your claim depends on a particular triterpene being present in meaningful quantity, put the ratio in the brief; if the claim is generic, the total is enough.
Madecassoside as an isolated material
Madecassoside supplied on its own is a different proposition. The assay is high, the material is a defined chemical rather than a plant mixture, and the variability problem largely disappears.
What it costs is the obvious trade-off. Per kilogram of finished formula, an isolated material is several times the cost of a standardised fraction at a comparable triterpene contribution, and the marketing advantage is what pays for it: a pack can name the molecule rather than the plant.
The formulation advantage is real as well. An isolated material is easier to dissolve, contributes less colour, and does not carry the plant's other soluble components into the base. In an otherwise pale, minimal formula, that difference is visible. Our article on discolouration covers why the visible difference matters more than it sounds.
Reading a specification: markers, carriers and colour
Four items turn a centella trade name into something you can formulate with:
- The INCI name, which tells you which of the three materials you are being offered.
- The marker compounds and their guaranteed content, with the analytical method named. A percentage without a method is a claim, not a specification.
- The carrier system. Extracts are usually supplied in water and a glycol, and the glycol load arrives with the ingredient. That affects both the sensory result and the preservation calculation.
- Colour and odour descriptors. Plant-derived materials vary visibly. If your pack is translucent, ask for a colour range rather than a single colour.
This is the same discipline that applies to any botanical. Our INCI and ingredient safety article covers how the naming conventions vary between markets, which matters if you are launching in several at once.
Solubility, pH and where centella goes in a formula
Extract-based centella materials are water-soluble and go into the water phase, which makes them easy to add to an aqueous serum. Isolated madecassoside is also water-soluble but takes longer to dissolve and benefits from being pre-dissolved in a small amount of water before it joins the batch.
The pH question is undemanding: centella materials are stable across the normal serum range, and they do not impose a pH requirement of their own. In an acidic formula the pH is set by the acid, and the centella simply travels with it.
Two formulation details are worth knowing. Centella contributes to the electrolyte load, so a thickened base may need adjustment — the same effect described in our article on viscosity and skin feel. And in an anhydrous or capsule fill, an extract has to be handled as a dispersion rather than a solution, because the carrier glycol and the water it brings cannot simply be dissolved into oil.
The colour and odour problem
Plant extracts bring plant colour. Centella materials range from pale straw to a distinctly brown solution depending on the batch and the degree of processing, and that colour is a real constraint on product design.
In an opaque tube or a coloured bottle the issue disappears. In a clear serum or a translucent capsule it does not, and a batch-to-batch colour difference will be spotted by a customer who has bought the product twice. Our discolouration article sets out how to write that tolerance into the specification.
Odour follows the same logic. Centella has a faint herbal, slightly earthy note. Fragranced lines mask it without difficulty; fragrance-free, minimal formulas do not, and one sampling round is usually enough to make that clear.
What centella is positioned for, and the claim boundary
The ingredient supports appearance and feel claims: skin looks calmer and more even, feels more comfortable, looks less reactive. Those are consumer-testable observations and they sit inside the cosmetic zone.
What is not available is anything describing a physiological process or a skin condition. Wording that implies inflammation control, tissue repair or treatment of a condition moves the product out of the cosmetic category regardless of how the ingredient is marketed upstream. Our efficacy testing article covers how the permissible versions are built and substantiated.
Centella pairs naturally with the comfort-focused ingredients — panthenol, allantoin, ceramides in an emulsion — and the combination is easier to claim honestly than centella alone. See our panthenol article for the sensory side of that pairing.
The three sourcing routes compared
| Route | What it is | Cost position | Formulation notes |
|---|---|---|---|
| Whole-plant extract | Solvent extract of the plant; mixture | Lowest | Variable; adds colour, glycol and salts; level means little unaided |
| Standardised triterpene fraction | Extract concentrated to a stated total triterpene content | Moderate | Comparable between suppliers once the marker is fixed |
| Isolated madecassoside | Purified single molecule, high assay | Highest | Pale, predictable, easy to dissolve; nameable on the pack |
Testing to commission
- Assay of the marker compounds on incoming material, independent of the supplier certificate.
- Colour and odour observation at release and at each stability point, especially in a translucent pack.
- Viscosity check where the base is polymer-thickened, since the extract adds ionic load.
- Preservative efficacy on the finished formula — the glycol and water the extract brings are not a preservation system.
- Consumer use testing against the appearance claim you intend to print.
How to write the brief
Name the INCI, not the plant. State the marker compounds and the guaranteed content, and ask for the analytical method. State the carrier. State the colour tolerance if the pack is translucent. State the market and the claim.
What to avoid: a brief that says "centella extract at 2%". It specifies a weight of an undefined mixture, and it leaves the only decision that determines whether the product delivers to someone else. Our stability article covers the testing that follows.
Where our capability fits
We formulate standardised centella fractions and isolated madecassoside in aqueous serums, emulsions and capsule fills, with the marker specification agreed before sampling starts. Examples include a botanical purifying essence and a hydrating soothing repair face cream.
We work with brands on private label (your brand on a proven base), OEM/ODM contract manufacturing, and full custom formula development — whichever matches where your brand is today.
Tell us which centella material you are specifying and what the product needs to claim, and we will come back with the source, the level and the specification. Start at our inquiry page, email capsulebiotech@163.com, or message the right team on WhatsApp: Capsule Series (capsules only) +86 158-7655-5319, Cosmetics Series (serum, hair care, body care, fragrance) +86 158-7655-5319.
General manufacturing information, not regulatory or legal advice. Claim limits vary by market.