Ingredient review
Holmium Oxide
INCI: HOLMIUM OXIDE
Holmium oxide is a rare earth oxide used as a colorant in cosmetics; it is generally considered safe at low concentrations but has limited research on skin absorption.
In plain English
Holmium oxide is a mineral-based pigment that gives a pink or yellow color to makeup products like eyeshadows and nail polishes. It is a rare earth compound, meaning it comes from a group of elements that are not commonly found in nature. In cosmetics, it is used in very tiny amounts just to add color, and it is not expected to have any active skincare benefits.
Review score
Safety, usefulness, and evidence
Higher-caution ingredient
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Holmium Oxide 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Holmium Oxide.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
Holmium oxide is an inorganic compound made from the rare earth element holmium and oxygen. It appears as a pale yellow or pink powder and is used as a pigment in cosmetics.
How it works
In a cosmetic product, holmium oxide sits on the surface of the skin or nails and reflects light to create a specific color. It does not penetrate the skin or interact with biological processes; its role is purely aesthetic.
Pros
Vibrant color
Holmium oxide provides a bright, stable pink or yellow hue that doesn't fade easily in makeup products.
Low irritation risk
At the tiny concentrations used in cosmetics, it is unlikely to cause skin irritation or allergic reactions for most people.
Cons and cautions
Limited research
There is very little published research on how holmium oxide interacts with human skin over time, making its long-term safety less certain.
Environmental concerns
Mining rare earth elements like holmium can be environmentally disruptive, and the extraction process may produce toxic byproducts.
Best for
- Anyone looking for a unique pink or yellow pigment in makeup
- People who prefer mineral-based colorants
Use caution if
- Those with known sensitivities to rare earth metals
- Individuals seeking active skincare ingredients
Usage tips
Safety summary
Holmium oxide is considered safe for use in cosmetics at very low concentrations based on limited data. However, due to the lack of extensive skin absorption and long-term exposure studies, it is best used in products that are not left on the skin for extended periods.
Research notes
There are few peer-reviewed studies specifically on holmium oxide in cosmetics. Most safety assessments rely on general rare earth oxide toxicology, which suggests low acute toxicity but highlights the need for more research on chronic exposure.
Common label clues
- Typical concentration
- Very low (typically less than 1%)
- Regulatory status
- In the US, holmium oxide is not specifically listed as a prohibited or restricted cosmetic ingredient by the FDA, but it must be used in accordance with general safety requirements. In the EU, it is allowed as a colorant in cosmetics under certain conditions.
- Common uses
- Nail polish, Eye shadow, Lip products
- Environmental note
- Rare earth mining, including for holmium, can lead to soil and water pollution if not managed responsibly. Some manufacturers are exploring recycled sources.
Good to know
- Holmium oxide is not a common ingredient and is mostly found in specialty or high-end color cosmetics.
- It is sometimes used in glass and ceramic coloring as well.
Common questions
What is Holmium Oxide in beauty products?
Holmium oxide is a mineral-based pigment that gives a pink or yellow color to makeup products like eyeshadows and nail polishes. It is a rare earth compound, meaning it comes from a group of elements that are not commonly found in nature. In cosmetics, it is used in very tiny amounts just to add color, and it is not expected to have any active skincare benefits.
What does Holmium Oxide do in a beauty product?
In a cosmetic product, holmium oxide sits on the surface of the skin or nails and reflects light to create a specific color. It does not penetrate the skin or interact with biological processes; its role is purely aesthetic.
Is Holmium Oxide safe for most people?
Holmium oxide is considered safe for use in cosmetics at very low concentrations based on limited data. However, due to the lack of extensive skin absorption and long-term exposure studies, it is best used in products that are not left on the skin for extended periods.
Who should be careful with Holmium Oxide?
Those with known sensitivities to rare earth metals Individuals seeking active skincare ingredients
Research sources
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.