Ingredient review

Methylthiophenyl Morpholino Isobutanone

INCI: METHYLTHIOPHENYL MORPHOLINO ISOBUTANONE

A synthetic UVA filter that helps protect skin from sun damage, generally considered safe and non-irritating.

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In plain English

This is a man-made ingredient added to sunscreens to absorb UVA rays, which are a type of sunlight that can cause skin aging and damage. It works like a sponge, soaking up UV energy and turning it into harmless heat. You'll find it in many daily sunscreens and moisturizers with SPF.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 5

Potentially useful with some tradeoffs

The evidence base is useful, but some claims depend heavily on the formula.

Risk flags are low for most users, though the finished product can still irritate.

Source
synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Methylthiophenyl Morpholino Isobutanone is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

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

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Methylthiophenyl Morpholino Isobutanone.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

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

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic organic compound designed to absorb UVA radiation, part of a newer generation of UV filters that offer broad-spectrum protection.

How it works

When applied to the skin, it absorbs UVA light and converts it into low-level heat, which is then released from the skin. This prevents UVA rays from penetrating deeper layers and causing damage like premature aging or DNA harm.

Pros

Effective UVA protection

Absorbs UVA rays efficiently, helping to prevent skin aging and long-term damage.

Low irritation potential

Generally well-tolerated, making it suitable for sensitive skin types compared to some older chemical filters.

Cons and cautions

Limited global approval

Not approved by the FDA in the United States, so it's not available in US sunscreens, which can be confusing for consumers.

Systemic absorption concerns

Like many chemical filters, some studies show it can be absorbed into the bloodstream, though health implications are still being studied.

Best for

  • Anyone seeking broad-spectrum UVA protection
  • People with sensitive skin looking for a non-irritating chemical filter

Use caution if

  • Those who prefer mineral-only sunscreens
  • Individuals in regions where this filter is not approved (e.g., US)

Usage tips

Apply sunscreen generously 15 minutes before sun exposure for best protection.
Reapply every two hours, or after swimming or sweating, to maintain effectiveness.

Safety summary

Generally considered safe for topical use at approved concentrations, with low irritation risk. However, ongoing research monitors systemic absorption and environmental impact.

Research notes

Evidence supports its effectiveness as a UVA filter with good photostability. Human studies show minimal skin penetration, but long-term systemic effects require further investigation.

Common label clues

Typical concentration
Up to 5% in leave-on products
Regulatory status
Approved as a UV filter in the EU and many other countries, but not yet approved by the FDA in the United States.
Common uses
Sunscreens, Daily moisturizers with SPF, Anti-aging products with sun protection
Environmental note
Some studies suggest synthetic UV filters may accumulate in aquatic environments, but specific data on this ingredient is limited.

Good to know

  • This ingredient is often combined with other UV filters to provide broad-spectrum protection.
  • It is more commonly used in sunscreens outside the United States, such as in Europe and Asia.

Common questions

What is Methylthiophenyl Morpholino Isobutanone in beauty products?

This is a man-made ingredient added to sunscreens to absorb UVA rays, which are a type of sunlight that can cause skin aging and damage. It works like a sponge, soaking up UV energy and turning it into harmless heat. You'll find it in many daily sunscreens and moisturizers with SPF.

What does Methylthiophenyl Morpholino Isobutanone do in a beauty product?

When applied to the skin, it absorbs UVA light and converts it into low-level heat, which is then released from the skin. This prevents UVA rays from penetrating deeper layers and causing damage like premature aging or DNA harm.

Is Methylthiophenyl Morpholino Isobutanone safe for most people?

Generally considered safe for topical use at approved concentrations, with low irritation risk. However, ongoing research monitors systemic absorption and environmental impact.

Who should be careful with Methylthiophenyl Morpholino Isobutanone?

Those who prefer mineral-only sunscreens Individuals in regions where this filter is not approved (e.g., US)

Research sources

European Chemicals Agency (ECHA) - Substance InfoOpenPubMed - Safety of UV FiltersOpenCosmetic Ingredient Review (CIR) - UV FiltersOpen

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.