SPF stands for sun protection factor. It measures how well a sunscreen protects the skin from UVB rays, the main cause of sunburn.

SPF is calculated by comparing how long it takes for skin to burn with sunscreen versus without it. For example, SPF 30 means it takes 30 times longer to burn.

This number gives a useful guide—but it doesn’t tell the full story.

What SPF really tells you

SPF only measures protection from UVB rays. It doesn’t cover UVA rays, which also harm the skin and cause skin aging.

To protect against both, look for products labeled broad spectrum or broad-spectrum protection. These sunscreens block both UVA and UVB rays, helping reduce signs of aging, photosensitivity, and long-term skin damage.

Understanding the SPF formula

The formula used is simple:
SPF = MED with sunscreen / MED without sunscreen
MED stands for minimal erythemal dose—how much UV causes redness.

If it takes 10 minutes to burn without sunscreen, and 300 minutes with it, that’s SPF 30.

Choose SPF based on your skin type, time outdoors, and whether you have sensitive skin or a family history of skin damage.

Types of sunscreen and their benefits

There are two main types of sunscreen: physical (mineral) sunscreen and chemical sunscreen.

Mineral sunscreens use ingredients like zinc oxide to reflect UV rays. They’re great for sensitive skin and often found in all-mineral sunscreen formulas.

Chemical sunscreens absorb UV rays before they damage skin. Many formulas now include hydration. They have antioxidant protection. They also have botanical ingredients. These help support the skin against pollution and environmental stressors.

How to maximize sun protection

To stay safe in the sun, follow these simple steps:

1. Apply sunscreen 15 minutes before going outside.

2. Use water-resistant formulas for swimming or sweating.

3. Practice reapplication every two hours.

4. Wear UV-blocking sunglasses and protective clothing.

5. Don’t miss areas like ears, neck, and hands during sunscreen application.

Real-world considerations

The sun affects your skin even on cloudy days. UV radiation passes through clouds and windows, causing damage over time.

Choose sunscreens with broad spectrum SPF 50 for strong defense. Look for ones that don’t leave a white cast and are safe for outdoor activities and facial use.

Some sunscreens now reduce coral bleaching and support ocean health. Always check sunscreen expiration dates and store them away from heat.

Sunscreen and product development

Sunscreen is a popular feature in many skincare products. Formulas are developed with user needs in mind. They range from travel-size sunscreen to everyday moisturizers.

Options include anti-pollution blends, SPF 30, SPF 50+, self tanners, and sunless tanners. Some even help restore collagen and elastin for younger-looking skin.

Whether the goal is protection, hydration, or a glowing finish, formulas must meet safety and quality standards.

Please contact us to get started with your custom sunscreen project.