Centella Asiatica Extract in Cosmetics: How to Qualify a Replacement Grade

When a new supplier quotes Centella asiatica extract, pull the approval record for the grade already in use. Look for the conditions the original sample had to meet. The raw material may have needed a minimum madecassoside content. The serum may have had to stay clear during storage. The finished cream may have been tested to support a hydration claim. Each condition needs a different check before the replacement can be approved.

Start with the Assay that Mattered in the Original Approval

If the original specification sets a madecassoside minimum, ask for the madecassoside result on the proposed lot. A higher figure for total triterpenes leaves that requirement open. Madecassoside, asiaticoside, madecassic acid and asiatic acid can be measured separately by HPLC, so ask for the individual results when the specification depends on them (Shen et al., 2014).

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Ask your Centella asiatica extract supplier how the total was determined and which compounds it covers. “HPLC tested” names the technique. The report still needs to identify what was measured and whether the percentage is on a dried basis or applies to the material as supplied. If the two suppliers report on different bases, resolve that before using the numbers to set the trial addition.

An extract ratio belongs on a separate line. Ask which way it is written and whether it refers to the extract before the addition of a carrier. It describes the relationship between starting plant material and extract. For a formula that requires a minimum marker content, the lab still needs the assay. Where possible, compare the actual lot results for the original and proposed grades. A specification limit tells you what the supplier will accept. The lot result tells you what the lab is about to weigh.

Keep the First Trial Close to the Approved Formula

Check the full composition before adding the sample. A Centella asiatica extract powder may contain a carrier, and a liquid grade may introduce water, glycerin or another solvent. If the liquid supplies glycerin, include it in the formula total. Otherwise, a change in the serum’s feel could be difficult to attribute to the extract itself.

Make the first trial at the existing pH target and follow the original mixing procedure where practical. Compare it with the approved formula at the same age after manufacture. In a clear serum, record clarity and color, and check for sediment during storage. An opaque cream may tolerate a color shift that would fail the clear serum’s appearance standard. Set that limit before deciding whether the candidate passes.

If the serum turns hazy, note when the haze first appears. A cloudy premix gives you a reason to revisit the solvent and dispersion step. A clear premix that turns hazy only after addition puts the working pH, the other ingredients and the order of addition on the list to investigate. The timing helps narrow the next trial. Changing the extract, pH and thickener together makes it harder to learn which change mattered.

Check the Claim Against the Test that Supports It

A lot can meet the marker limits and give a stable serum while leaving the efficacy question open. Ratz-Łyko et al. (2016) measured skin hydration and transepidermal water loss in cosmetic formulations containing Centella asiatica extract. Those findings apply to the extract and formulas tested in that study.

For a replacement, start with your own finished-product report. If the original claim rests on a hydration reading at a particular time, use that endpoint and time point when planning a focused comparison. A material change in the marker profile or carrier gives the team a concrete reason to consider retesting. The assay establishes what went into the batch. The hydration test addresses what the finished product delivered.

Frequently Asked Questions

References

• Ratz-Łyko, A., Arct, J., & Pytkowska, K. (2016). Moisturizing and antiinflammatory properties of cosmetic formulations containing Centella asiatica extract. Indian Journal of Pharmaceutical Sciences, 78(1), 27–33.
• Shen, Q., Yu, L. S., Zhou, H., & Zeng, S. (2014). Simultaneous determination of madecassoside, asiaticoside and their aglycones in Centella asiatica (L.) Urban extracts by RP-HPLC. Journal of Zhejiang University (Medical Sciences), 43(2), 135–140.