Understanding sunscreen protection
Protecting your skin from the sun is essential to help prevent sunburn, premature skin aging, and certain skin cancers. However, with so many options available at the pharmacy, it can be difficult to know where to start: SPF 30 or 50? Mineral or organic? Lightweight or water-resistant?
Here are a few simple guidelines to help you make an informed choice.
UVA and UVB: what’s the difference?
The sun emits two main types of UV rays, which affect the skin in different ways.
UVA
UVA rays penetrate deep into the skin. They contribute to skin aging (wrinkles, dark spots, loss of elasticity) and also play a role in the development of skin cancer. They are present year-round, even on cloudy days and through windows.
UVB
UVB rays affect mainly the surface of the skin. They are the primary cause of sunburn. Their intensity varies depending on the time of day, season, and UV index.
A good sunscreen should offer broad-spectrum protection, meaning protection against both UVA and UVB rays. This is usually indicated on the label (a circled UVA logo or the term “broad spectrum”).
SPF 30 or 50: which should you choose?
The Sun Protection Factor (SPF) indicates the level of protection against UVB rays.
SPF 30: blocks about 97% of UVB rays
SPF 50: blocks about 98% of UVB rays
The difference may seem small, but SPF 50 may be preferred for sensitive skin, children, or individuals with a history of skin cancer or prolonged sun exposure.
No sunscreen blocks 100% of UV rays.
The most important step is proper application: using enough product and reapplying regularly.
Mineral or organic: two effective types of protection
Sunscreens are generally divided into two main categories: mineral (physical) and organic (chemical).
Mineral sunscreens
These contain ingredients such as zinc oxide or titanium dioxide. They protect the skin through filters that interact with UV rays. Formulations have improved significantly and are now much lighter and easier to apply than in the past. They are generally well tolerated, making them a good option for sensitive skin and young children. They also provide immediate protection upon application. However, some formulas may leave a slight white cast, especially on deeper skin tones, although tinted and ultra-fine versions are available.
Organic sunscreens
These use filters that absorb UV rays before they can damage the skin. They are often preferred for their lightweight, invisible finish, especially on the face or under makeup. They typically need to be applied about 15 to 30 minutes before sun exposure to ensure full effectiveness.
Mineral or organic: which is better?
In reality, both types of sunscreen are considered safe and effective when used as directed.
Despite concerns circulating online, experts agree that there is currently no strong evidence showing that organic sunscreen filters are harmful to health when used properly.
The best sunscreen is the one you will actually use consistently. Texture, finish, and comfort all play an important role in daily use.
Myths vs. facts
“I tan, so I don’t need sunscreen.”
False. Tanning is a sign that the skin is reacting to UV damage. All skin types benefit from daily sun protection.
“Mineral sunscreens are always better.”
Not necessarily. Both types are effective. The best choice depends on your skin type and personal preference.
“On cloudy days, sunscreen isn’t necessary.”
False. UVA rays pass through clouds and are present year-round.
Good sun protection habits
Even the best sunscreen cannot do everything on its own. For optimal protection:
Apply generously to all exposed skin
Reapply every two hours, or after swimming, sweating, or towel drying
Wear a hat and sunglasses when the UV index is high
Seek shade, especially during peak sun hours
Don’t forget commonly missed areas: ears, neck, lips, hands, and feet
The best sunscreen is the one that fits your skin, your routine, and that you’ll actually use every day. Consistent sun protection is key to helping protect your skin year-round.