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Ingredient · INCI reference

Isoamyl p-Methoxycinnamate

An oil-soluble organic UVB sunscreen filter (INN amiloxate) from the cinnamate family, used to absorb ultraviolet light in the UVB range.

Amiloxate CAS 71617-10-2

What it is

Isoamyl p-Methoxycinnamate is a liquid, oil-soluble organic sunscreen agent that absorbs primarily UVB radiation. It is approved as a UV filter in the EU, Japan, and Korea but is not among the filters approved for sunscreens in the United States. As a cinnamate it is not fully photostable on its own and is typically combined with broad-spectrum and stabilizing filters in a finished formula.

Spectrum coverage

UVB

UVA-I 340–400nm UVA-I (340–400nm) — not covered UVA-II 320–340nm UVA-II (320–340nm) — not covered UVB 290–320nm UVB (290–320nm) — covered

Regional approval · max %

JP ✓ 10% Japan: Approved · Max 10% KR ✓ 10% South Korea: Approved · Max 10% EU ✓ 10% Europe: Approved · Max 10% US — — United States: No data

Safety & warnings

It is used within regulated maximum concentrations and is generally well tolerated. As a cinnamate it carries some potential for contact or photo-allergic reactions in predisposed individuals, though such reports are relatively uncommon. It is rated non-comedogenic and is not classified as an endocrine disruptor in the manifest data.

Reef-toxic
No
Endocrine disruptor
No
Comedogenicity
0

Origin & sourcing

Synthetic, produced as an ester of methoxycinnamic acid with isoamyl (isopentyl) alcohol.

Questions everyone asks

What kind of UV does amiloxate absorb?

It absorbs primarily in the UVB range, so it is combined with other filters to achieve broad-spectrum coverage.

Why is it not in US sunscreens?

It is approved as a UV filter in the EU, Japan, and Korea but has not been approved for use in sunscreens in the United States.

Sources & references

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