Naticide

Overview

Naticide is a preservative also sold under the trade names Plantaserv M and Multifunctional Additive in some markets. It comes as a clear liquid with a pronounced sweet almond, marzipan, and vanilla aroma — the smell is the first thing every hobbyist notices when they open the bottle.

Here is the surprising part — and the reason this entry exists. Naticide’s INCI is “Parfum” (or “Fragrance” in the US). Not benzyl alcohol, not phenethyl alcohol, not any of the actual active ingredients. Just “Parfum.”

This is because the manufacturer keeps the exact composition as a trade secret and the regulatory loophole that lets them do this is to declare the whole thing as a fragrance ingredient (fragrance compositions are allowed to keep individual components confidential under EU and US cosmetic regulations). Industry analysis and patent literature suggest the actives include phenethyl alcohol, anisic acid, and similar gentle aromatic preservatives, but there is no official confirmation and you will not find a meaningful ingredient breakdown on the safety data sheet either.

For a hobbyist, this is a problem. If a customer is allergic to a specific fragrance component, you cannot tell them what is in your product because you don’t actually know. If a customer is sensitive to “fragrance” as a category, they will avoid your product on principle — even though Naticide is technically working as a preservative. Flag this clearly to anyone you give the product to.

What it does in a formula

Primary role: broad-spectrum preservation. Naticide is marketed as effective against bacteria, yeasts, and moulds. The exact mechanism is undisclosed but is presumably the combined antimicrobial activity of several aromatic alcohols (benzyl alcohol, phenethyl alcohol, anisic acid family) — which is consistent with the marzipan-vanilla aroma.

Secondary role: it is, genuinely, a fragrance. Naticide brings a noticeable sweet almond-amaretto-vanilla scent to anything it preserves, and at the higher end of its use range that scent dominates. Some formulators use it as a 2-in-1 preservative-and-fragrance for dessert-themed products (vanilla body lotions, almond hand creams).

How to use

Use at 0.3-1% of the total formula. 0.5% is a typical starting point. Higher use rates intensify the scent dramatically.

Add to the cool-down phase, below 40°C. While the aromatic components are reasonably heat-stable, the scent is volatile and you will lose intensity if you add it hot.

Works in pH 4-8, which is wider than Cosgard or Geogard ECT. This is one of Naticide’s practical advantages — it can handle shampoos and conditioners that sit closer to neutral pH.

It dissolves in both water and oil, which is unusual for preservatives in this family and makes it easy to use in clear formulas without solubilisation issues.

Best for / Worst for

Best for: dessert-themed body products (vanilla butter, almond lotion), hand creams, body milks, anything where a sweet aromatic scent is welcome. Also useful in formulas where you want to skip a separate fragrance and let the preservative pull double duty.

Worst for: unscented or “fragrance-free” formulas (Naticide will scent the product). Products marketed to fragrance-sensitive customers. Citrus or fresh-floral fragranced products, where the marzipan note clashes badly. And — importantly — any product where ingredient transparency is a key selling point. If your brand pitch is “you can pronounce every ingredient,” Naticide’s “Parfum” INCI undermines that promise.

Common pitfalls

Treating the “Parfum” INCI as a feature: it is technically legal, but ethically it is murky. If a customer has fragrance allergies, you cannot help them. If a regulator audits your product, you have to defer to a confidential supplier composition. Some hobbyists choose Naticide specifically because the INCI looks short and clean on a label — that is, frankly, marketing-driven and worth thinking twice about.

The scent dominates: at 1% Naticide is louder than most fragrances. Use sparingly in the cool-down phase and smell as you go. If you also want to add a fragrance oil, dial Naticide to 0.3% and let the fragrance carry the scent profile.

Assuming it is fully tested: independent challenge-test data on Naticide-only formulas is limited compared to Cosgard or Liquid Germall Plus. Supplier data sheets are the main source. For commercial products you intend to sell at scale, pay for a real challenge test in your specific formula rather than relying on supplier claims.

Scent fading: Naticide is volatile and the marzipan scent can fade over months in storage. The preservative activity is more stable than the scent, but if the product also smells less, the preservative may be partly gone too.

Stacking with fragrance: if you add a separate fragrance oil and then Naticide, you are layering two complex fragrance materials. Patch test on yourself before assuming customers will love it.

Substitutes

• Geogard ECT — also natural-positioning, also brings a marzipan-almond note, but with a real INCI you can disclose to customers.
• Cosgard (Geogard 221) — Ecocert-certified, more transparent INCI, no scent dominance.
• Optiphen — fragrance-neutral, broader pH range, no trade-secret issues. The honest choice if you want a clean preservative.
• Euxyl K 903 — similar gentle profile to Naticide, but with a transparent INCI.