Spilanthes Extract

Overview

Spilanthes (Acmella oleracea, formerly classified as Spilanthes acmella) is a flowering plant native to tropical regions of South America, commonly called paracress or the “toothache plant” — because chewing the flower heads causes a numbing, tingling sensation in the mouth. That same mechanism is what makes it interesting for cosmetics.

The key active compound is spilanthol (an alkylamide), which acts on sensory nerve endings and causes temporary relaxation of subcutaneous muscle fibres. This is not the same mechanism as botulinum toxin. Botox blocks nerve signals at the neuromuscular junction. Spilanthol works topically and temporarily on the muscle fibres themselves. The effect fades completely when you stop using the product. Still, clinical studies show measurable reduction in the depth of expression lines (crow’s feet, forehead lines) with consistent use over 28 days.

Cosmetic extracts come as water-soluble (hydroglycolic) or oil-soluble (CO2 or lipophilic) forms. Some are standardised to spilanthol content. Shelf life is 12-18 months.

What it does in a formula

• Temporary muscle relaxation — reduces the tension in facial muscles that creates expression lines
• Wrinkle depth reduction — measurable in clinical studies after 4 weeks of consistent use
• Local anaesthetic/tingling — creates the characteristic buzzing sensation, especially useful in lip products
• Lip plumping — the tingling stimulates mild local blood flow, temporarily increasing lip volume
• Antimicrobial — spilanthol has broad-spectrum antimicrobial activity as a secondary benefit

The wrinkle-smoothing effect is real but modest. Expect a visible softening of fine expression lines, not a dramatic frozen-face result. It is a cosmetic improvement, not a medical procedure.

How to use

For water-soluble (hydroglycolic) extracts: add to the water phase or cool-down, below 40 C.

For oil-soluble (CO2) extracts: add to the oil phase or cool-down.

Usage rates by product type:

• Anti-wrinkle serums: 3-5%
• Eye creams (expression line area): 2-4%
• Lip plumpers: 1-3% (start low — the tingling is intense)
• Anti-ageing face creams: 2-4%
• Forehead and crow’s feet treatments: 3-5%

Pairs well with peptides (acetyl hexapeptide-8 for layered expression-line targeting), hyaluronic acid (hydration plumps lines from below while spilanthol relaxes from above), and retinol (long-term wrinkle reduction alongside the immediate smoothing effect).

Best for / Worst for

Best for: anti-wrinkle serums, expression line treatments, lip plumpers, eye creams targeting crow’s feet, “natural botox alternative” product positioning, mature skin lines.

Worst for: sensitive or reactive skin (the tingling can be perceived as irritation), baby or children’s products, products for customers who dislike any tingling sensation on skin, lip products for people with very sensitive lips.

Common pitfalls

Over-concentrating in lip products. At 3%+ in a lip product, the tingling can cross from “pleasant plumping sensation” to “my lips are on fire.” Start at 1% and work up.

Marketing it as “natural Botox.” The mechanism is entirely different from botulinum toxin. Making Botox-equivalent claims invites regulatory scrutiny and customer disappointment. Position it as “expression line relaxation” or “muscle-soothing.”

Expecting permanent results. The effect lasts only as long as the product is used. Discontinue and lines return to baseline within days.

Ignoring the tingling in full-face products. Some customers will interpret any tingling as irritation or an allergic reaction. If your serum tingles noticeably, explain it on-label or in product info.

Wrong extract type for your formula. Water-soluble and oil-soluble forms are not interchangeable. Match to your formula base.

Substitutes

• Acetyl hexapeptide-8 (Argireline) — peptide-based expression line smoother, no tingling.
• DMAE — skin-firming and muscle-toning active, different mechanism.
• Capsaicin (very low %) — tingling/plumping in lip products, but from chilli rather than spilanthol.
• Ginger extract — mild warming and circulation-boosting for lip plumpers.
• Syn-Ake (dipeptide diaminobutyroyl benzylamide diacetate) — synthetic peptide mimicking temple viper venom, targets expression lines.