A "Botanical Extract" Is Not One Thing
In cosmetics, the term "botanical extract" is misleadingly broad. From the same plant you can obtain a water extract, a glycerin extract, a glycol extract, an oil extract (macerate), a CO2 extract or a dried powder extract — and their active content, solubility and formulation behavior are completely different. The formulator's first job is to understand exactly what the extract in hand is: its carrier/solvent system, active concentration and standardization status. Saying "green tea extract" tells you almost nothing technically.
Solubility and Solvent Systems
The extract's carrier determines which phase of the formula it goes into:
- Water / glycerin / glycol-based extracts: enter the water phase; can affect pH and electrolyte balance and require preservative compatibility.
- Oil-based macerates and CO2 extracts: enter the oil phase; oxidative stability and color contribution must be considered.
- Powder/dry extracts: must be pre-dissolved in a suitable solvent; insoluble particles cause turbidity or sediment.
When solubility is misjudged, the extract crashes out, the phase separates, or the active isn't where it should be. Requesting the supplier's recommended solubility and use phase is standard practice.
Standardization of Actives
For an extract to "work," the molecule(s) of interest must be present at a consistent level. Standardization normalizes the extract to a defined marker/active percentage (e.g. polyphenols, a specific flavonoid, total acids). In a non-standardized extract, active content fluctuates with harvest, batch and processing, creating both efficacy inconsistency and claim risk.
Practical consequences for the formulator:
- Where possible, prefer a marker-standardized extract; the spec should state the marker and the test method.
- If it is not standardized, do not build claims whose active content you cannot verify yourself.
- Calculate the use level against the standardized marker concentration — "percent of extract" alone is not enough.
INCI and Labeling
Botanical extracts in INCI typically reflect both the plant and the carrier: e.g. "Camellia Sinensis Leaf Extract" alone, or together with other INCI components in a glycerin/water system. Watch for:
- The carrier (water, glycerin, glycol) listed as a separate INCI component.
- The correct INCI choice among "Extract," "Oil," "Powder," "Water" — these are different materials.
- A preservative in a liquid extract is also declared on the label.
What Does Claim Substantiation Actually Require?
Building a cosmetic claim such as "soothing," "brightening" or "antioxidant" for a natural active requires, in the EU, that the claim be substantiated. The evidence burden scales with the strength of the claim. A realistic evidence hierarchy:
| Evidence type | What it provides |
|---|---|
| Raw-material literature (in vitro/publication) | Mechanistic basis; alone it does not prove the finished product |
| Supplier efficacy dossier | Marker/active level and reference studies |
| Finished-product testing (in vivo / use test) | Strongest support for the final product |
| Consumer perception test | Perception claims of the "skin felt softer" type |
The critical point: a study on the raw material does not automatically prove the finished product's claim — because the concentration, bioavailability and matrix in the final product differ. The EU cosmetic claim criteria (legal compliance, truthfulness, evidential support, honesty, fairness, informed decision-making) therefore require keeping the claim consistent with use level and context. "It's natural, therefore it's good" is not a claim; you must express a measurable, supportable benefit.
Build the Formulation–Claim Bridge Early
The most common mistake is to finish the formula and then go looking for a claim. The correct order is the reverse: define the claim up front, dose the active at a sufficient and standardized level to support it, and build the evidence dossier in parallel with the formula. This yields a product defensible to both regulators and marketing.
Supply-Side Checklist
- Are the extract's carrier/solvent system and recommended use phase stated?
- Is there marker-based standardization and a test method?
- Is a per-batch analysis (active/marker percentage) provided?
- Are the INCI breakdown and preservative content clear?
- Is raw-material efficacy data available to support the claim?
Properly standardized and used in the right phase, botanical extracts add both functional and narrative value to a formula. Working with a supplier offering marker-based standardization, batch analysis and a transparent INCI breakdown is the foundation for making your claims defensible. For specification and sample needs, our team is available.