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Last reviewed: June 2023

Authors: Dr Libby Whittaker, Medical Writer, New Zealand (2023)
Previous contributors: Dr Louise Reiche, dermatologist (2007); Vanessa Ngan (2005-2012); Dr Amanda Oakley, dermatologist (2013); Dr Helen Gordon (2020)

Reviewing dermatologist: Dr Ian Coulson

Edited by the DermNet content department


What is sunscreen?

Sunscreens are topical agents that can be applied to the skin to protect against ultraviolet (UV) radiation

Exposure to UV radiation (UVR) contributes to skin ageing and is the main cause of skin cancer (eg, basal cell carcinoma, squamous cell carcinoma, and melanoma). Sun protection methods, including sunscreen and sun protective clothing, are important in reducing these damaging effects.

The term ‘sunblock’, previously synonymous for sunscreen, is now considered misleading given that no sunscreen ‘blocks’ 100% of UVR. 

What is sunscreen used for?

Ultraviolet (UV) radiation can be classified as ultraviolet A (UVA), ultraviolet B (UVB), and ultraviolet C (UVC). Solar UVC (wavelength 100–280 nm) is absorbed by the Earth’s atmosphere. 

Sunscreen is used to protect the skin against the harmful effects of UVA and UVB radiation that reach the earth’s surface (see below for Benefits of sunscreen). It is recommended to apply sunscreen daily when the UV index is forecast to reach 3 or higher.

Table 1. Types of ultraviolet radiation

Wavelength (nanometres)
  • Long wavelength
  • 320–400 nm
  • 2 types: UVA I (340–400 nm) is less potent than UVA II (320–340 nm)
  • Medium wavelength
  • 290–320 nm
  • Accounts for up to 95% of UV radiation reaching the Earth’s surface
  • Can penetrate clouds and glass (eg, windows)
  • Accounts for 5% of UV radiation reaching the earth’s surface
  • Mostly intercepted by ozone layer
  • Intensity varies by season, location, and time of day; most intense between 10am-4pm in summer
  • At high altitudes and on surfaces such as snow and ice, up to 80% of UVB rays are reflected so they hit the skin twice
Effect on skin
  • Penetrates skin more deeply than UVB rays, damaging skin cells in the basal layer of the epidermis and reaching into the dermis
  • Leads to tanning, photoaging, and hyperpigmentation
  • Contributes to skin cancer
  • Suppresses skin immune function
  • 5–30 minutes of UVB exposure (skin phototype dependant) a day helps the skin to produce bone-building Vitamin D3
  • Too much UVB is also the main cause of skin reddening and sunburn by damaging the upper epidermal layers of skin
  • Can cause hyperpigmentation and contribute to skin cancer
  • Suppresses skin immune function

How do sunscreens work?

Chemical sunscreens work by absorbing UVR

‘Physical’ sunscreens (also called inorganic filters, ‘blockers’, or mineral-based sunscreens) were previously thought to reflect or scatter UVR. Studies have since shown that, like ‘chemical’ sunscreens, they provide UV protection primarily via absorption of UVR. 

Types of sunscreens

Chemical sunscreens

  • Chemical sunscreens (organic filters or ‘absorbers’) often contain a combination of ingredients to provide both UVB and UVA protection.
  • Types of agents include:
    • Aminobenzoic acid derivatives (eg, Padimate O)
    • Benzophenones (eg, oxybenzone)
    • Cinnamates (eg, octocrylene)
    • Salicylates (eg, homosalate).
  • Photostable agents octocrylene, bemotrizinol, and bisoctrizole are often combined with other chemical absorbers to enhance the overall stability of the sunscreen.

Mineral/‘physical’ sunscreens

The most common physical sunscreens contain inorganic metal oxides, titanium dioxide, or zinc oxide, which:

  • Reflect photons in visible light range, and work as chemical filters in the UV range
    • Titanium dioxide absorbs up to 400 nm
    • Zinc oxide absorbs up to 370 nm.
  • Are chemically inert, safe, and provide broad spectrum UVA and UVB coverage
  • Are photostable and often combined with photo-unstable ‘chemical’ agents.

Microsized or ultrafine grades (‘nanoparticles’) of titanium dioxide and zinc oxide have improved ease of application and cosmesis, and reduced white residue on the skin. Potential toxic or carcinogenic effects of nanoparticles have been raised, however, no adverse effects have been demonstrated. The established benefits of sun protection are considered to outweigh these theoretical risks.

Primary and secondary sunscreens

Sunscreens can also be considered either primary or secondary. In primary sunscreens, sun protection is the main function; while in secondary sunscreens (eg, makeup) it is not.

Sunscreen ingredients

Table 2 provides information on different sunscreen ingredients (non-exhaustive) and the protection they offer against UVA and UVB radiation. Many sunscreen products contain combinations of ingredients to optimise UV protection and photostability.

Table 2. Sunscreen agents and their coverage against UVA and UVB radiation

Chemical UVB (290–320 nm)

UVA II (320–340 nm)


(340–400 nm)

Aminobenzoic acid derivatives
Para-aminobenzoic acid (PABA) Partial None None
Glyceryl PABA Partial None None
Padimate O (octyl dimethyl PABA) Partial None None
Roxadimate Complete Partial None
Dioxybenzone Complete Complete Partial
Oxybenzone Complete Complete Partial
Sulisobenzone Complete Complete Partial
Octocrylene Complete Partial None
Octyl methoxycinnamate (octinoxate) Complete None None
Ethoxyethyl p-methoxycinnamate (cinoxate) Complete Partial None
Homomenthyl salicylate (homosalate) Partial None None
Ethylhexyl salicylate (octyl salicylate / octisalate) Partial None None
Trolamine salicylate Complete None None
Other chemical sunscreen ingredients
Avobenzone (butyl methoxydibenzoylmethane) None Complete Complete
Ecamsule (terephthalylidene dicamphor sulfonic acid; Mexoryl SX) Partial Complete Complete
Ensulizole (phenylbenzimidazole sulfonic acid) Complete Partial None
Bemotrizinol (Tinosorb S) Complete Complete Complete
Bisoctrizole (Tinosorb M) Complete Complete Complete
Metal oxides
Titanium dioxide Complete Complete Partial
Zinc oxide Complete Complete Complete

Note: recent proposed sunscreen regulation changes by the FDA (2019 and 2021) affect some of the above ingredients. Specifically:

  • Titanium dioxide and zinc oxide are proposed as safe and effective.
  • PABA and trolamine salicylate are proposed as not safe and effective.
  • More information is needed to determine the safety of 12 other ingredients: padimate O, dixoybenzone, oxybenzone, sulisobenzone, octocrylene, octinoxate, cinoxate, homosalate, octisalate, avobenzone, ensulizole, and meradimate.

Sunscreen and the coral reef

Some chemical sunscreen ingredients have been banned in certain locations (eg, Hawaii, the US Virgin Islands, and Palau), due to concerns about the negative effects on coral reefs. These include:

  • Oxybenzone
  • Octocrylene
  • Octinoxate
  • Avobenzone.

In these locations, mineral sunscreens (zinc oxide and titanium dioxide) are generally preferred. Check local regulations for specific details and the most up-to-date information. 

Sunscreen protection ratings

Sunscreen ratings include information about protection against UVA and UVB protection. Sun protection factor (SPF) ratings pertain primarily to UVB protection as UVB is the primary cause of sunburn.

UVB protection rating

Sun protection factor (SPF) is the ratio of the UV radiation dose it takes to cause a barely detectable sunburn on a person treated with a sunscreen product (coverage of 2 mg/cm2) compared to that required for untreated skin.

While the length of exposure that results in sunburn varies between individuals, a way to conceptualise what the SPF number on a sunscreen product means is to think of it in terms of ‘difference in time to sunburn’. For example, if it takes 10 minutes to burn without sunscreen, skin protected with SPF 15 sunscreen (sufficiently applied) would be expected to take ~15 times as long to receive the same sun-burning UV radiation dose (ie, 150 minutes).

  • The higher the SPF number, the better the expected protection.
  • An SPF 15 sunscreen provides about 94% protection against UVB.
  • Protection against UVB is increased to 97% with SPF 30 and 98% with SPF 50+.

Table 3. SPF ratings and protection against sunburn over duration of sun exposure

SPF value Accumulating sun-burning dose (%) over time with different SPF sunscreens*
10 mins 30 mins 150 mins
1 (no protection) 100% 100% 100%
15 6.7% 20% 100%
30 3.3% 10% 50%
50 2% 6% 30%

*Assumes application of 2 mg/cm2. In reality, many people do not apply this amount of sunscreen so the expected sun protection may not be achieved.

UVA protection rating

More evidence about UVA-induced skin damage prompted a focus on methods to determine UVA protection, often referred to as a sunscreen’s ‘broad spectrum’ performance.

While there is no universally agreed standard for testing and measuring UVA protection, most countries have moved away from the in vivo persistent pigment darkening (PPD) method and now use in vitro methods. 

Measures include UVA protection factor (UVA-PF) and critical wavelength (CW). 

  • UVA-PF: protection performance of a sunscreen against UVA radiation. Often considered as a ratio against the SPF value; many regulatory bodies require that UVA-PF is at least 1/3 of the SPF to be considered ‘broad spectrum’.
  • CW: wavelength at which 90% of the cumulative area under the total solar radiation absorbance curve from 290–400 nm occurs. ‘Broad spectrum’ generally designates CW ≥370 nm, indicating greater protection against longer wavelength UVA rays.
  • Some countries simply use a star rating to approximate UVA performance — 5 stars offering higher UVA protection.

Sunscreen testing

Due to ethical concerns about in vivo testing, in its 2006 Recommendation 2006/647/EC the European Commission encouraged the sunscreen industry to develop in vitro testing methods for both UVB and UVA protection.

UVB (SPF) testing

Currently, SPF testing is still done using in vivo methods, such as the international standard ISO 24444. 

Several in vitro testing methods are in development; the in vitro ‘double plate’ method (ISO Committee Draft 23675) and the hybrid diffuse reflectance spectroscopy method (ISO Committee Draft 23698) are in the final stages of international standardisation. These should become the first published ISO standards for in vitro SPF testing in the next few years. 

UVA testing

Table 4. UVA protection testing

Region Methods for testing UVA protection

Australia / New Zealand
(as per AS/NZS 2604:2021)

  • UVA-PF and CW* – using the method as defined by the international standard ISO 24443

European Union
(as per Cosmetics Europe Recommendation No 25, Use of appropriate validated methods for evaluating sun product protection, 2013)

  • UVA-PF and CW using the method as defined by ISO 24443 = reference method for EU
  • Results obtained previously through the Colipa Test Method remain valid; retesting not required
  • In vivo testing using the method as defined by the international standard ISO 24442 can also be used; however, in vitro testing is preferred

United Kingdom
(as per Cosmetic Toiletry and Perfumery Association, Guidance Note on Durable Claims for Sunscreens, 2022)

  • Best practice is to use ISO 24443 in vitro testing

United States of America

(as per FDA Final Administrative Order 2021)

  • CW of ≥370 nm as assessed by the broad spectrum testing procedure detailed in Over-the-Counter (OTC) Monograph M020.90


(as per Health Canada, Primary Sunscreen Monograph, 2022)

  • CW of ≥370 nm as determined using a standardized and reproducible method, such as FDA, ISO, or Colipa protocols

*UVA-PF: ultraviolet A protection factor; CW: critical wavelength

Water resistance testing

Methods for testing sunscreen water resistance vary internationally, and include:

  • FDA method — OTC Monograph M020.80(g) (Final Administrative Order, Sept 2021)
  • COLIPA 2005 method (Guidelines for Evaluating Sun Product Water Resistance)
  • International standards ISO 16217 (Water immersion procedure for determining water resistance) and ISO 18861 (Percentage of water resistance)

Testing currently involves in vivo protocols, as SPF is measured after immersion for the specified time period.

Sunscreen labelling

UVB and UVA ratings provide information for sunscreen labelling, so consumers can identify which products offer the best protection. Although category and labelling descriptions vary, Australia/New Zealand, Europe, the United States, and Canada are closely aligned. 

The terms ‘sunblock’, ‘waterproof’, or ‘sweatproof’ are considered inaccurate and misleading and no longer permitted on sunscreen labels.

Specific labelling guidelines are provided in Table 5 below. Cited guidelines may be updated or replaced; checking with the relevant body for the most up-to-date information is advised.

Table 5. Sunscreen labelling guidelines

Region UVB UVA Water resistance

Australia / New Zealand

(as per AS/NZS 2604:2021)

SPF value (minimum SPF 4; maximum allowed labelled value SPF 50+, for products with SPF ≥60 only)

‘Broad spectrum’ label (optional; if UVA-PF ≥ 1/3 SPF and critical wavelength ≥370 nm)

No numerical UVA-PF claims to be made on sunscreen labels

‘Water resistant’ qualified by duration (up to maximum of 4h)

SPF ≥8 after immersion for any products labelled as water resistant


(as per COLIPA Recommendations No 16, Water Resistance Labelling, 2005; and No 23, Important usage and labelling instructions for sun protection products, 2009)

SPF value (minimum SPF 6) UVA logo (the letters ‘UVA’ printed inside a simple circle) if UVA-PF is at least 1/3 of the labelled SPF and critical wavelength is at least 370 nm (recommended minimum level of protection) ‘Water resistant’ or ‘Very water resistant’


(as per FDA Final Order 2021)

SPF value (minimum SPF 2)

Products that are broad spectrum with SPF values from 2–14 must be labelled with a ‘Skin Cancer/Skin Aging Alert’ warning statement

‘Broad spectrum’ (optional; if critical wavelength ≥370 nm)

Products that are not broad spectrum must be labelled with a ‘Skin Cancer/Skin Aging Alert’ warning statement

‘Water resistant (40 minutes’ or ‘Water resistant (80 minutes)’ (optional)

If not water resistant, recommend to ‘use a water-resistant sunscreen if swimming or sweating’


(as per Health Canada, Primary Sunscreen Monograph, 2022)

SPF value (minimum SPF 2; SPF >50 to be labelled as SPF 50+) ‘Broad spectrum’ (optional; if critical wavelength ≥370 nm)

‘Water/sweat resistant’ 40 or 80 minutes (optional)

If not water resistant, label needs to include: ‘Use a water-resistant sunscreen if swimming or sweating’

Category descriptions to indicate the overall degree of sun protection conferred (low, medium, high, or very high) are also recommended for sunscreen products in Australia/New Zealand and the EU. Table 6 provides details on what these categories mean.

Table 6. Sunscreen protection categories*

Category label UVB (Australia/NZ) UVB (EU) UVA**
Measured SPF Labelled SPF Measured SPF Labelled SPF
Low protection 4–14 4, 6, 8, 10 6–14 6, 10

UVA-PF at least 1/3 of the labelled SPF (ie, SPF/UVA = <3)


Critical wavelength

≥370 nm

Medium protection 15–29 15, 20, 25 15–29 15, 20, 25
High protection 30–59 30, 40, 50 30–60 30, 50
Very high protection ≥60 50+ ≥60 50+

*As per AS/NZS 2604:2021 and European Commission Recommendation (2006/647/EC)

**Select secondary sunscreen products (lipsticks and colour cosmetic products eg, tinted bases or foundations) are exempt from the UVA requirement as per AS/NZS 2604:2021

Sunscreen selection

General recommendations for selecting an appropriate sunscreen based on particular characteristics and conditions are outlined below in Table 7.

Table 7. Sunscreen selection advice

Characteristics/conditions Considerations for sunscreen selection
Skin phototype
  • Fair skin that burns easily: high-SPF (50+) broad-spectrum sunscreen
  • Skin that tans readily: choose a sunscreen with an intermediate SPF (15+)
  • Darker skin without photosensitivity: sunscreen may not be needed
Sensitive skin
  • Look for hypoallergenic/low irritant sunscreens
Sunscreen allergy
  • Patch testing recommended to identify specific allergen/s and guide appropriate sunscreen selection in the future
Dry skin
Oily skin or prone to acne
  • May benefit from choosing a sunscreen in a lighter base, such as an alcohol-based lotion or gel, or one designated as ‘non-comedogenic
If active outdoors or swimming
  • ‘Water resistant’ sunscreen recommended
  • Reapply as indicated eg, ‘SPF 15 – water resistant 40 min’
Windy conditions
  • Do not apply aerosol sunscreens in windy conditions – up to 93% can be lost in wind gusts ≥20 km/hr (occurs often in many popular Australian beaches)
Sunscreen for specific body areas
  • Hairy skin areas: lighter sunscreens are easier to apply
  • Nose/lips/around the eyes: sunscreen sticks can be used
  • Don’t apply aerosol sunscreens directly to the face; caution should be taken to avoid inhalation and eye exposure
Pregnancy and breastfeeding
  • Sun protection remains important
  • Limited data on any clinical significance of potential systemic absorption of chemical sunscreens
  • Mineral sunscreens (eg, zinc oxide, titanium dioxide) may be preferred
  • Avoid applying sunscreen close to the areola while breastfeeding
Infants and babies
  • Use other sun protection measures first-line such as shade and clothing
  • When additional sun protection is required, recommend using SPF 30+ broad-spectrum sunscreen
  • Zinc oxide and titanium dioxide may be less likely to cause skin irritation than chemical sunscreens
  • Rationale: infants have a thin, less developed skin barrier so may be more likely to become irritated or sensitised by sunscreen ingredients or absorb more systemically
  • Mineral sunscreens (eg, titanium dioxide, zinc oxide) are preferred as they are not irritating, provide good broad-spectrum protection, and are not systemically absorbed

Sunscreen application

  • Check sunscreen is within the use-by date.
  • Apply daily if the ultraviolet index is 3 or higher.
  • Expected sun protection is only provided if sunscreens are applied in quantities similar to the ones used for testing (2 mg/cm2). This equates to about 35mL of lotion (approx. 7 teaspoons) for an average-sized adult — requirements may vary depending on body habitus and clothing:
    • ~4 teaspoons for the limbs (1 for each arm and each leg)
    • 1 teaspoon each for the front and back of the trunk/torso
    • 1 teaspoon for the head (face, ears, and neck).
  • Should be applied at least 20–30 minutes before sun exposure.
  • Reapply every 2 hours in the setting of ongoing sun exposure.
  • Reapply after swimming, heavy sweating, or if partially rubbed off (eg, by towel use).
  • Sunscreen should be used in conjunction with other aspects of sun protection including sun protective clothing, avoiding sun exposure during peak sunshine hours (approx. 10am to 4pm in summer), and staying in the shade where possible.
  • Insect repellents may reduce the SPF of sunscreen so when using both together, apply a sunscreen with a higher SPF and re-apply it more often.
    • In 2019, the FDA proposed designating combination sunscreen and insect repellent products as not safe or effective. 

What are the benefits of sunscreen?

Sunscreen is particularly useful for those with fair skin such as skin phototypes I, II, and III. 

The benefits of wearing a broad-spectrum sunscreen include:

What are the disadvantages of sunscreen?

  • Many people do not apply sufficient sunscreen to optimise sun protection.
  • No sunscreen blocks 100% of ultraviolet radiation or is fully waterproof or sweatproof.
  • Some sunscreen formulations or products may be less preferable depending on skin type or cosmetic appearance. Fortunately, there are a range of sunscreens available.
  • Some chemical sunscreens may impair coral reef growth and contribute to coral bleaching.
    • Scientific regulation around sunscreen products marked as ‘reef-safe’ is an evolving area.
  • Many sunscreens that protect against UVR do not protect against visible light. Those with photodermatoses triggered or aggravated by visible light (eg, melasma, postinflammatory hyperpigmentation, solar urticaria, cutaneous porphyrias, and some cases of chronic actinic dermatitis) should consider using tinted sunscreens (eg, ‘Dundee cream, available in 3 different colours’) which contain non-micronised titanium dioxide, zinc oxide, and iron salts, as only sunscreens that remain visible on the skin will photoprotect against visible light.
  • Sunscreens have potential side effects (see below).

What are the side effects and risks of sunscreen?

Common side effects include:

Less commonly, allergic contact dermatitis may develop due to a sunscreen component, eg, a fragrance, preservative, or a sunscreen chemical.

Sunscreen allergy has been reported to individual sunscreen agents including PABA, benzophenones, cinnamates, salicylates, avobenzone, ecamsule, ensulizole, bemotrizinol, and bisoctrizole. This may be either an allergic or a photocontact reaction.

The FDA has proposed that PABA (aminobenzoic acid) lose its status as GRASE (generally recognised as safe and effective) due to safety concerns including significant rates of allergic contact dermatitis and photocontact dermatitis, and cross-sensitisation that may cause allergies to other medications (eg, sulfonamide antibiotics, thiazide diuretics, and some local anaesthetics). PABA use in sunscreen products is now less common.

Other sunscreen safety considerations

Systemic absorption of chemical sunscreens

  • Studies have demonstrated systemic absorption following topical use of a number of chemical sunscreen agents including avobenzone, oxybenzone, octocrylene, ecamsule, homosalate, octisalate, and octinoxate (Matta et al, 2020).
  • Animal and in vitro studies have also demonstrated that some of these agents (eg, homosalate, oxybenzone, and octinoxate) have the potential to affect endocrine activity (Krause et al, 2012; Lorigo et al, 2018).

Research into the clinical significance of these findings is ongoing. The FDA has proposed that further information is needed prior to regarding these and other sunscreen agents (except zinc oxide and titanium dioxide) as GRASE (generally recognised as safe and effective). However, this does not conclude that chemical sunscreens are unsafe for use, and sun protection should remain a priority.

Trolamine salicylate has been associated with cases of systemic absorption and adverse reactions including increased bleeding risk and salicylate toxicity. It is no longer commonly used in sunscreen products and has been proposed to lose its GRASE status.


Safety queries relating to zinc oxide and titanium dioxide ‘nanoparticles’ have been raised regarding reactive oxygen species, the potential for systemic absorption, and possible associated carcinogenicity. Research in this area is ongoing.

To date, no adverse effects have been demonstrated and the general consensus is that the well-established benefits of sun protection outweigh any potential long-term risks. 

Vitamin D

  • Concerns that sunscreen protection against UVB radiation, which is involved in Vitamin D production, could contribute to Vitamin D deficiency, were not shown with real-life recreational sunscreen use in randomised controlled trials.
  • Vitamin D supplements (oral capsules) are available if deficiency is a concern.

For more information, see Vitamin D.

What are the contraindications to sunscreen?

  • Hypersensitivity reactions to an ingredient (see: Sunscreen allergy).
  • Some sunscreen ingredients are banned in certain locations (eg, Hawaii, Palau, and the US Virgin Islands) due to concerns about coral reef protection; check local guidelines before travelling.

Approved datasheets are the official source of information for medicines, including approved uses, doses, and safety information. Check the individual datasheet in your country for information about medicines.

We suggest you refer to your national drug approval agency such as the Australian Therapeutic Goods Administration (TGA), US Food and Drug Administration (FDA)UK Medicines and Healthcare products regulatory agency (MHRA) / emc, and NZ Medsafe, or a national or state-approved formulary eg, the New Zealand Formulary (NZF) and New Zealand Formulary for Children (NZFC) and the British National Formulary (BNF) and British National Formulary for Children (BNFC).



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