Research shows that not all daily moisturising creams that contain UV filters and claim to provide broad spectrum UV protection provide UVA protection. Day moisturisers are an established part of our skincare routine and skincare manufacturers are increasingly adding UV filters to skin care products as the link between UV radiation and photo-ageing progresses has been proven.
A review of the ingredients of the 29 top selling day creams with claims of broad spectrum UV (using sales volumes from the US website Amazon) assessed the level of UVA protection that could be expected from the product, looking for the presence of the UVA filters – avobenzone, octocrylene, ecamsule (L’Oreal patented Mexoryl SX) and zinc oxide.
- 6 of these 29 products contained no active ingredients that provide UVA protection.
- 7 of the remaining 23 contained zinc oxide but only 3 contained levels greater than 5 % required to provide ‘adequate’ UVA protection.
- 16 products contained avobenzone but only 3 had adequate concentrations of octocrylene necessary to stabilise the avobenzone, notoriously unstable on contact with UV rays.
Although the study notes that further research is needed to investigate the actual UVA protection provided by the products, the researchers conclude that many day creams do not offer long wave UVA protection.
Source: http://www.ncbi.nlm.nih.gov/pubmed/21242349
Topically applied sunscreens protect by absorbing or reflecting radiation at the skin surface. UV filters can be grouped into two broad categories: organic (previously called chemical) and inorganic (previously called physical) (Yaar and Gilchrest, 2007). Organic sunscreens absorb UVR, convert it into heat, and thus prevent photons from interacting with molecules in the skin. Organic sunscreens are usually „invisible‟ and hence cosmetically appealing.
Sun Protection Factor (SPF) of a sunscreen is primarily a measure of protection against UVB. It is defined as the minimal perceptible erythema, or minimal erythema dose (MED) ratio between sunscreen-protected and unprotected skin. If a person normally experiences the onset of redness to unprotected skin after 10 minutes of sun exposure, sunscreen with SPF 8 would provide protection against perceptible sunburn for 80 minutes. SPFs are now also categorised as providing low to very high protection: Low protection SPF 6 to 14/Medium protection SPF 15 to 29/High protection SPF 30 to 50/Very high protection SPF 50 + (i.e. SPF 50+).
It is recommended that people select sunscreens with SPF 30 or higher (Palm and O‟Donoghue, 2007) because they generally do not apply sufficient quantities of the product. The recommended SPF 30 takes into account these behavioural factors that lead to a reduced level of protection (if applied adequately, then SPF 15 is sufficient).
UVA stars
Sunscreens that offer both UVA and UVB protection are called „broad spectrum‟. The ‘star system’ indicates a product’s UVA protection, i.e.the % of UVA radiation absorbed by the sunscreen in comparison to UVB or the ratio between the level of protection afforded by the UVB protection and the UVA protection. Five stars indicates excellent protection against UVA equal to the SPF against burning, whereas one or more stars implies UVA protection equal to one or more fifths of the SPF against burning (Wahie et al., 2007). If choosing a low SPF, it may have a high level of stars, not because it is providing high UVA protection, but because the ratio between the UVA and UVB protection is about the same. That is why it is important to use a high SPF in conjunction with high UVA protection!
The Sunscreen Rules
- The overall message in terms of sunscreen use is – more is better.
- Choose a sunscreen labelled „photostable, broad spectrum‟ which offers both UVA and UVB protection.
- Use a „high protection‟ sunscreen of at least SPF 30 to protect against UVB and high UVA protection - at least 4 stars and the circular UVA logo.
Application guidance
- Apply half an hour before going out in the sun, and half an hour after commencing sun exposure to prevent an additional 65 to 80 percent of UV light (Lowe, 1990) and corrects missed patches of skin. Don’t forget your the other exposed areas – head, neck and ears (Fry and Verne, 2003).
- Reapply sunscreen at least every two hours, and immediately after contact with water, even if the sunscreen is „water resistant‟, and also after towel drying.
- Apply sunscreen liberally. Adults should apply an equivalent to a full shot glass (~35 ml) evenly on the whole body (Wulf et al., 1997) and rub it in after application in order to avoid skip areas (Neale et al. 2002, Barr 2005).
- Aftercare is also important. Apply aftersun products to moisturise your skin after sun exposure.
Preventing skin cancer
The role of photoprotection products against malignant melanoma is complex. A systematic review in 2003 failed to show that sunscreen use had any preventive effect (Dennis et al., 2003). However, used appropriately, sunscreens have been shown to be extremely efficient against burning, DNA damage and immunosuppression of the skin. Regular and careful use of sunscreens has been clearly shown to reduce the incidence of actinic keratoses and squamous cell carcinomas but not necessarily basal cell carcinomas (Darlington et al., 2003; Green et al., 1999).
Source
The tanned face is attractive but over-exposure to the UV light is damaging to the skin cell’s DNA and causes sunburn (in severe cases also blistering and pain). Take care and prevent skin cancer (melanoma), now the most common cancer amongst women in their 20s!
Stay Safe in the Sun
- Avoid the sun during the hottest part of the day, between 11am and 3pm. Find shade under umbrellas, trees or other shelters.
- Always cover up, sunscreen alone is not enough. Wear T-shirts, wide-brimmed hats and UV protective sunglasses.
- Apply sunscreen generously, also when travelling as sun will still have an effect on your skin through the windows.
- Use sunscreen with UVB protection of at least SPF 30 (SPF 50 for children and people with pale skin) and also high UVA protection.
- Keep babies and young children out of direct sunlight!
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If concerned about changes in your skin following sun exposure – particular attention should be paid to moles that change in shape, size or colour – consult a local specialist. FaceWorkshops have teamed up with a Consultant Dermatologist, Dr James Britton, at Spire Hull and East Riding Hospital. You can see him privately or your GP can refer you via the NHS, please call for his contact details.
