Zinc Oxide (ZnO, CAS 1314-13-2) is an inorganic mineral compound and one of only two UV filters currently recognised as GRASE (Generally Recognized as Safe and Effective) by the US FDA — the other being Titanium Dioxide. It provides true broad-spectrum protection against both UVA and UVB radiation primarily by absorbing UV energy (with scattering as a secondary mechanism) while remaining on the skin surface. The SCCS has concluded that zinc oxide is safe as a UV filter at concentrations up to 25% for dermal application — and confirms that ZnO particles do not significantly penetrate intact human skin. SkinSenseDiary safety rating: 2/10 (low risk). No harmonised human health GHS classification under CLP Annex VI (environmental classifications may apply at supplier level). No allergen flags. No conflicts. Also used as a colorant (CI 77947). The SCCS has noted that ZnO nanoparticles in spray/aerosol products raise safety concerns due to inhalation risk. Found in 3,323 products.
Zinc Oxide (INCI: ZINC OXIDE, CAS 1314-13-2) is an inorganic mineral compound with the molecular formula ZnO and a molecular weight of 81.38 Da. It is a white, powdery solid that occurs naturally as the mineral zincite. In cosmetics, it serves two primary functions: as a UV filter providing broad-spectrum protection against both UVA and UVB radiation, and as a white colorant (CI 77947). Zinc oxide is one of only two UV filters currently classified as GRASE under the US FDA OTC drug framework — the other being Titanium Dioxide — reflecting its long history of safe and effective use in sun protection.
Unlike chemical (organic) UV filters such as avobenzone, homosalate, or octinoxate, zinc oxide is a physical (mineral/inorganic) UV filter. Modern research shows that zinc oxide works primarily by absorbing UV radiation (with scattering as a secondary mechanism) while remaining on the skin surface — the long-held belief that mineral sunscreens work mainly by "reflecting" UV is now considered outdated. The SCCS has confirmed through multiple opinions (SCCS/1489/12 and the 2014 revision SCCS/O/137) that zinc oxide particles — both nano and non-nano forms — do not significantly penetrate intact human skin. Small amounts of zinc ions may be released from the particles, but these quantities are negligible compared to baseline zinc levels already present in the body (zinc is an essential trace element). The SCCS concluded that zinc oxide is safe as a UV filter at concentrations up to 25% for products applied to the skin. Our database identifies zinc oxide in 3,323 products — the most of any UV filter.
A key safety distinction: while zinc oxide is safe for dermal application, the SCCS has noted that ZnO nanoparticles in spray or aerosol products raise safety concerns due to inhalation risk — inhaled ZnO nanoparticles can cause lung inflammation. This limitation applies specifically to nano-sized particles in aerosolised formats — it does not affect cream, lotion, stick, or non-spray liquid sunscreens. In the United States, the FDA's 2019 proposed sunscreen monograph update reaffirmed zinc oxide's GRASE status, while requesting additional safety data for several chemical UV filters. Zinc oxide has no harmonised human health GHS classification under CLP Annex VI (environmental classifications such as H410 may appear in supplier self-classifications), no allergen flags, and no conflicts in our ingredient database. No CIR Expert Panel safety assessment exists specifically for zinc oxide, as it is primarily regulated as an OTC drug ingredient in the US rather than a cosmetic ingredient.
Zinc oxide is one of very few single ingredients that provides true broad-spectrum protection across the entire UV spectrum — from UVA I (340–400 nm), UVA II (320–340 nm), to UVB (290–320 nm). Most chemical UV filters cover only a portion of this range and must be combined with other filters to achieve broad-spectrum coverage. Zinc oxide's broad coverage makes it particularly effective at protecting against UVA-induced photoageing, hyperpigmentation, and long-term skin damage, in addition to UVB-induced sunburn.
As a mineral filter, zinc oxide works primarily by absorbing UV radiation (with scattering as a secondary mechanism) while remaining on the skin surface. The SCCS confirms that ZnO particles do not significantly penetrate intact human skin — meaning no meaningful systemic absorption occurs, though trace amounts of zinc ions may be released (negligible compared to baseline body zinc levels). This is a significant advantage for those concerned about chemical filter absorption (the FDA has documented systemic absorption of several chemical UV filters above proposed safety thresholds). Zinc oxide begins working immediately on application — there is no 15–20 minute wait time as recommended for some chemical sunscreens.
Zinc oxide's non-penetrating mechanism makes it the UV filter of choice for sensitive, reactive, and compromised skin. It is routinely recommended for babies, individuals with rosacea, eczema, or post-procedure skin, and during pregnancy. Zinc oxide is less likely to cause stinging, irritation, or allergic contact dermatitis compared to chemical UV filters. Its anti-inflammatory properties (zinc is a known anti-inflammatory agent) can actually help calm reactive skin. Many paediatric and dermatologist-recommended sunscreens use zinc oxide as their primary or sole UV filter.
Beyond UV protection, zinc oxide has mild antimicrobial and anti-inflammatory properties. Zinc compounds have been used medicinally for centuries — zinc oxide paste (e.g., calamine lotion) is a well-established treatment for skin irritation, nappy rash, and minor wounds. In sunscreen formulations, these ancillary properties can benefit acne-prone skin (mild antibacterial action) and sensitive skin (anti-inflammatory soothing). Zinc oxide is generally considered non-comedogenic and is often included in formulations designed for oily and acne-prone skin types.
Suitable for: All skin types, including sensitive, reactive, rosacea-prone, eczema-prone, acne-prone, and post-procedure skin. Routinely recommended during pregnancy and nursing. Suitable for babies and children. Particularly recommended for those who experience irritation from chemical UV filters, or who prefer a non-penetrating sunscreen option. Available in both nano (more cosmetically elegant, less white cast) and non-nano formats.
Zinc Oxide carries a SkinSenseDiary safety rating of 2/10 — low risk. It is one of only two UV filters with GRASE recognition under the US FDA OTC drug framework. The SCCS has concluded it is safe at up to 25% for dermal application, and confirms that ZnO particles do not significantly penetrate intact human skin. No harmonised human health GHS classification under CLP Annex VI, no allergen flags, and zero conflicts. The primary limitation is that spray/aerosol products containing ZnO nanoparticles raise safety concerns according to the SCCS due to inhalation risk — choose cream, lotion, or stick formats instead. Found in 3,323 products in our database.
Inhalation safety concern in spray/aerosol products (SCCS): The SCCS has specifically stated that zinc oxide nanoparticles in spray products raise safety concerns due to inhalation risk. Inhaled ZnO nanoparticles can cause inflammation in the lungs. This applies to aerosol sprays and potentially to powder formats. If you use zinc oxide sunscreen, choose cream, lotion, fluid, or stick formats. Non-nano zinc oxide in non-spray products does not carry this concern. This limitation is about the delivery format, not the ingredient itself.
White cast: Zinc oxide is a white mineral that can leave a visible white residue on the skin — particularly noticeable on darker skin tones. Non-nano (larger particle) zinc oxide produces a stronger white cast than nano zinc oxide. Tinted zinc oxide sunscreens can address this issue. Formulation technology has improved significantly, and many modern zinc oxide sunscreens minimize white cast through particle size optimisation, tinting, and formulation engineering. If white cast is a concern, look for tinted formulations or nano zinc oxide in non-spray formats.
Nano vs non-nano — both safe on skin: The SCCS has confirmed that both nano and non-nano zinc oxide are safe for application to the skin at up to 25%. Neither form significantly penetrates intact human skin. The "nano" distinction matters primarily for inhalation exposure (sprays) and cosmetic elegance (white cast). Non-nano provides effective protection with a thicker, more visible finish; nano provides a more transparent, cosmetically elegant finish. Both are equally effective at UV protection when properly formulated.
Reapplication is essential: Like all sunscreens, zinc oxide products must be reapplied every 2 hours during prolonged sun exposure, and immediately after swimming, sweating, or towel-drying. No sunscreen — mineral or chemical — provides all-day protection from a single application. Zinc oxide has an advantage in that it provides immediate protection upon application (no wait time required).
Zinc oxide is widely regarded as among the most well-tolerated UV filters during pregnancy and nursing. As a mineral UV filter, it remains primarily on the skin surface — the SCCS confirms that ZnO particles do not significantly penetrate intact human skin, meaning systemic exposure is negligible. Zinc oxide has no harmonised GHS reproductive or developmental toxicity codes under CLP Annex VI (no H361d, no H362). Zinc oxide sunscreens are routinely recommended by dermatologists and obstetricians as a preferred sun protection option during pregnancy, particularly as an alternative to chemical UV filters — some of which (e.g., oxybenzone, octinoxate) have raised concerns about endocrine activity and have been detected in breast milk and blood. Both nano and non-nano forms are considered safe for dermal application during pregnancy. Sun protection itself is particularly important during pregnancy, as hormonal changes increase susceptibility to melasma (pregnancy mask). Consult your healthcare provider for individualised advice.
After cleansing, toning, applying serums, and moisturising, apply zinc oxide sunscreen as the final step of your morning skincare routine. Sunscreen should always be the last skincare product applied (before makeup). Zinc oxide provides immediate protection upon application — unlike some chemical sunscreens, there is no 15–20 minute wait time.
Most people apply far too little sunscreen. For the face alone, use approximately two finger-lengths of product (about 1/4 teaspoon or 1.25 ml). Apply evenly to the face, ears, and neck. Do not forget the backs of hands if they will be exposed. For the entire body, approximately 35 ml (about 7 teaspoons) is needed for full coverage. Insufficient application dramatically reduces the effective SPF.
No sunscreen provides all-day protection from a single application. Reapply every 2 hours during prolonged sun exposure, and immediately after swimming, heavy sweating, or towel-drying — even if using a water-resistant formula. For office workers with minimal sun exposure, a morning application with a midday touch-up is generally sufficient. Powder and stick zinc oxide products can be convenient for reapplication over makeup.
Zinc oxide sunscreens come in various formats — cream, lotion, fluid, tinted, stick, and hybrid (zinc oxide + chemical filters). Choose based on your skin type, lifestyle, and cosmetic preferences. If white cast is a concern, try tinted or nano formulations. If you have acne-prone skin, look for oil-free fluid formats. Avoid aerosol/spray zinc oxide products containing nanoparticles (the SCCS has noted inhalation safety concerns for this format).
100% mineral formulation using zinc oxide (often combined with titanium dioxide) as the only UV filters. Best for sensitive skin, babies, and during pregnancy. May have more visible white cast. SPF 30–50+ available.
Zinc oxide sunscreen with added iron oxide tints that eliminate white cast and provide light coverage. Iron oxides also offer additional protection against visible light and blue light. Excellent for daily wear under or instead of makeup.
Combines zinc oxide with chemical UV filters for better cosmetic elegance while maintaining broad-spectrum coverage. Lighter texture, less white cast. Good balance of protection and wearability. Not suitable if you want to avoid chemical filters entirely.
An excellent pairing. Niacinamide strengthens the skin barrier, regulates sebum, and has brightening and anti-inflammatory effects — all of which complement zinc oxide sunscreen. Neither ingredient interacts negatively with the other. Apply niacinamide serum first, then zinc oxide sunscreen on top.
Hydrating ingredients layer well under zinc oxide sunscreen. Apply hyaluronic acid serum and/or ceramide moisturiser first, allow to absorb, then apply zinc oxide sunscreen as the final step. The hydrating layers help zinc oxide spread more evenly and can reduce the drying feel some mineral sunscreens have.
Retinol increases UV sensitivity, making daily sunscreen essential. Zinc oxide is an ideal sunscreen partner for retinol users — it provides immediate, broad-spectrum protection with minimal skin penetration. Use retinol in the evening, zinc oxide sunscreen in the morning. This combination is one of the most recommended dermatological routines for anti-ageing.
L-ascorbic acid serums with a pH below 3.5 may theoretically affect zinc oxide stability, though in practice most well-formulated products coexist without issues. Apply vitamin C serum first, wait 10–15 minutes for it to absorb and the pH to neutralise, then apply zinc oxide sunscreen. Some dermatologists recommend using vitamin C in the evening if you find the combination pills or feels unstable.
If using glycolic acid, lactic acid, or salicylic acid in the morning, zinc oxide sunscreen is a good protective partner — these exfoliants increase UV sensitivity, and zinc oxide provides reliable broad-spectrum protection. However, some acid products can destabilise mineral sunscreen formulations. Apply acid, wait for absorption, then apply sunscreen. If pilling occurs, adjust your layering order or consider using acids in the evening only.
Layering multiple silicone-heavy products (primers, foundations) over zinc oxide sunscreen can cause pilling, balling, or an uneven finish. Zinc oxide sunscreens themselves often contain dimethicone. To reduce pilling: allow each layer to fully dry before applying the next, use lighter formulations, or choose a tinted zinc oxide sunscreen that replaces your foundation step.
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