Ingredient review

Phosphorothioate RNA-2 Cholesterol

INCI: SH-DS PHOSPHOROTHIOATE RNA-2 CHOLESTEROL

An experimental, cholesterol-linked RNA ingredient with potential for targeted skin delivery, but lacks broad safety and efficacy data for cosmetic use.

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In plain English

This is a lab-made molecule that combines a short piece of RNA with cholesterol. The cholesterol part helps it stick to skin cells, while the RNA part is designed to influence how those cells behave—like turning down certain genes. It's a very new and specialized ingredient, mostly found in cutting-edge anti-aging products. Because it's so new, there's not much public research on how well it works or if it's safe for everyday use.

Review score

Safety, usefulness, and evidence

3.0Fair

3.0/ 5

Useful in the right context, but not low-maintenance

The evidence base is still emerging, so marketing claims deserve extra caution.

Main practical flags: irritation is moderate; clogging risk is low.

Source: synthetic
Evidence: emerging
Irritation: moderate
Clogging risk: low

How reviews are scored

Quick decision guide

Read the cautions before using

Phosphorothioate RNA-2 Cholesterol can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

Step 1Start with the score, then check the irritation and clogging risk before judging Phosphorothioate RNA-2 Cholesterol.
Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

emerging

The ingredient may be promising, but claims should be treated more cautiously.

What it is

A synthetic oligonucleotide (a short strand of RNA) that has been chemically modified with a phosphorothioate backbone and attached to a cholesterol molecule. This structure is designed to improve stability and cell membrane penetration.

How it works

The cholesterol anchor helps the RNA fragment insert into skin cell membranes, allowing the RNA to interact with cellular machinery. It is thought to work by binding to specific messenger RNA (mRNA) and blocking the production of certain proteins, a process called RNA interference (RNAi). In cosmetics, this could theoretically reduce the expression of proteins involved in aging or pigmentation.

Pros

Novel mechanism

Uses RNA interference, a Nobel Prize-winning technology, to potentially target skin concerns at a genetic level.

Targeted delivery

The cholesterol modification may help the RNA reach specific skin cells more effectively than unmodified RNA.

Cons and cautions

Limited evidence

There are very few peer-reviewed studies on this specific ingredient in cosmetic formulations, so its real-world benefits are unproven.

Potential irritation

Synthetic RNA molecules can sometimes trigger an immune response or cause irritation, especially at higher concentrations.

Best for

Individuals interested in cutting-edge, experimental skincare
Those with specific concerns like deep wrinkles or hyperpigmentation who have not responded to conventional ingredients

Use caution if

People with sensitive or reactive skin
Pregnant or nursing individuals due to lack of safety data
Anyone preferring well-established, proven ingredients

Usage tips

Use only in products from reputable brands that provide third-party safety testing.

Start with a low concentration product and patch test before full-face application.

Store products containing RNA ingredients as directed, often in cool, dark conditions to maintain stability.

Safety summary

Safety data is extremely limited. The ingredient is synthetic and may pose risks of irritation or immune activation. It should be considered experimental until more research is available.

Research notes

RNA interference technology is well-studied in medicine, but its application in topical cosmetics is very new. No large-scale human trials for this specific ingredient were found in public databases.

Common label clues

Typical concentration: Very low, typically below 0.1%
Regulatory status: Not formally reviewed by major cosmetic regulatory bodies (e.g., EU CosIng, FDA). Use is experimental and not widely accepted in mainstream cosmetics.
Common uses: Anti-aging serums, Targeted treatments
Environmental note: Synthetic RNA compounds may persist in the environment; their ecological impact is unknown.

Good to know

This ingredient is not listed in the EU CosIng database as of 2025, meaning it has not been formally reviewed for cosmetic safety in Europe.
The 'SH-DS' prefix likely refers to a proprietary or research-grade designation, not a standard INCI modifier.

Common questions

What is Phosphorothioate RNA-2 Cholesterol in beauty products?

What does Phosphorothioate RNA-2 Cholesterol do in a beauty product?

Is Phosphorothioate RNA-2 Cholesterol safe for most people?

Safety data is extremely limited. The ingredient is synthetic and may pose risks of irritation or immune activation. It should be considered experimental until more research is available.

Who should be careful with Phosphorothioate RNA-2 Cholesterol?

People with sensitive or reactive skin Pregnant or nursing individuals due to lack of safety data Anyone preferring well-established, proven ingredients

Research sources

PubMed - RNA interference in skinOpen CosIng - EU Cosmetic Ingredient DatabaseOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.