38 SUN CARE
The study conducted was primarily a mechanistic investigation focusing on the effects of low-dose radiation on human skin, which allowed for a smaller sample size to be used. However, these findings are further supported by a longer-term, randomized study involving 903 adults in Australia.9 In this particular trial, no noticeable increase
in skin ageing was observed over a period of 4.5 years among individuals who applied broad-spectrum sunscreen on a daily basis. Additionally, the group of daily sunscreen users exhibited a 24% lower likelihood of experiencing increased skin ageing compared to a group of discretionary sunscreen users. Taking into account the studies mentioned
above, it can be concluded that regular application of sunscreen, preferably on a daily basis, slows down skin ageing in healthy adults by preventing UV-induced skin damage, even at sub-erythemal doses.
Benefit 2: UV filters can help reduce the effects of pigmentation disorders Disorders of pigmentation rank as the 11th most common condition observed by dermatologists,10
with dark spots being the
second most significant concern in facial skincare among consumers, following wrinkles.11 UV and visible light exposure can exacerbate all three main types of hyperpigmentation. 1. Age spots (Solar lentigo): These flat, tan,
brown, or black spots are frequently associated with ageing and are caused by UV radiation. Older adults, individuals with fair skin, and those with significant sun exposure are more prone to developing age spots. 2. Melasma: This condition manifests
as brown patches on the face and is more noticeable in individuals with darker skin tones. Melasma can be triggered by hormonal changes during pregnancy or sun exposure. 3. Post-inflammatory hyperpigmentation
(PIH): This is a temporary condition that arises following a skin injury (such as a thermal burn) or an inflammatory skin disorder (such as dermatitis or infection). In 2020, Fatima et al. conducted a
Vehicle control ■ Sunscreen ■
120 100 80 60 40 20 0
0 1 2 3 4 5 6 Day
Figure 1: Daily, low doses of UV radiation (sub-erythemal SSR) cause significant clinical, cellular, and molecular damage in skin types I/II. The graph shows how the accumulation of clinical and molecular photo damage is prevented by daily use of the sunscreen
comprehensive review of nine studies, involving over 600 individuals with skin of colour to assess the efficacy of sunscreen.11
Their findings
revealed the following: ■ Regular sunscreen application demonstrated improvements in pre-existing hyperpigmentation over an eight-week period in skin of colour.12 ■ Sunscreen use prevented the development of melasma in pregnant Moroccan women,13 and was more effective when using UV including visible light (VL) broad-spectrum sunscreen.14 ■ Applying broad-spectrum sunscreen reduced the incidence of post-laser PIH.15,16 Based on this review, we draw the following
key conclusions. Broad-spectrum sunscreens offering protection against UVA, UVB, and visible light can serve as an adjunctive therapy for melasma and PIH by stabilizing and preventing these disorders. Furthermore, there is a clear need to enhance
education on sun protection and sunscreen usage, particularly among individuals with darker skin tones.
Benefit 3: UV filters offer protection against blue light Increasing numbers of consumers are becoming aware of the blue light emitted by their digital devices. However, it is important to note that the sun remains the primary source of blue light, with radiation levels that are more than 100 times stronger than those emitted by electronic devices.17 Blue light has the ability to penetrate
deeper into the skin compared to UV rays, and studies have shown that it can induce even darker and more sustained pigmentation than with UVA radiation.18
This can result in
mottled pigmentation, which is a visible sign of photoaging.
7 8 9 10 11 12 13
PERSONAL CARE October 2023
www.personalcaremagazine.com
Mean erythema index ± SD
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