When Sunscreen Should Be Used? The 365-Day Rule | Rysun Biotech

Asking "when sunscreen should be used?" The scientific answer is every single day. Rysun Biotech’s R&D experts explain UV dynamics and how we manufacture lightweight SPFs for daily compliance.

When Sunscreen Should Be Used? A Manufacturer’s Guide to the 365-Day Rule

Introduction
For decades, sunscreen was viewed as a seasonal product—something you bought in July for a trip to the beach. However, as skin cancer rates rise and the science of photoaging advances, the narrative has shifted. Consumers are increasingly asking: "When sunscreen should be used?" Is it only for sunny days? What about indoors?

At Guangzhou Rysun Biotechnology, we view sunscreen as the foundation of skin health. Founded in 2014 by Ivy Wong to solve the "inconsistent quality" of market products, and specifically inspired by deep discussions with a Swiss anti-aging expert, we know that UV damage does not take a day off.

Backed by our Research Institute and 20 leading scientists, we are here to provide the definitive answer. Here is the scientific guide to why sun protection is a daily necessity and how Rysun manufactures products that make this habit easy to maintain.

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The Short Answer: Every Single Day

To answer "when sunscreen should be used?":
You should use it every day that ends in "Y."

• The Logic: UV radiation reaches the earth every day, regardless of temperature or weather.
• The Swiss Anti-Aging Philosophy: Prevention is cheaper than cure. It is easier to prevent collagen destruction with a daily SPF than to try and rebuild it later with expensive creams.

Scenario 1: Cloudy and Rainy Days

A common myth is that clouds block UV rays.

• The Science: Up to 80% of UV rays can pass through clouds. While you might not feel the heat (Infrared), the UVA rays (Aging) are still penetrating your dermis and destroying collagen.
• The Rysun Solution: We formulate lightweight daily lotions using our 105 product patterns. These are designed to feel like a moisturizer, encouraging consumers to wear them even when it looks gloomy outside.

Scenario 2: Indoors and In the Car

"I work in an office, do I need it?"

• The Science: UVB rays (Burning) are blocked by glass, but UVA rays (Aging) penetrate through windows. If you sit near a window or drive a car, you are being exposed to deep-penetrating radiation that causes wrinkles and sun spots.

• The Rysun Solution: We manufacture Broad Spectrum sunscreens that specifically target the UVA wavelength, providing invisible protection for the indoor lifestyle.

Scenario 3: Winter and Snow

• The Science: Snow reflects up to 80% of UV rays, nearly doubling your exposure. Winter sun is often more damaging than summer sun because of this reflection.
• The Rysun Solution: Cold weather dries out the skin. We utilize our 253 intellectual properties to create Hydrating SPFs enriched with Ceramides and lipids. These protect against UV rays while simultaneously repairing the winter windburn barrier.

The Manufacturer’s Role: Making "Daily" Possible

If the answer is "every day," why do consumers skip it? Texture.
People hate sticky, greasy, heavy sunscreens. They only wear them when they "have to" (at the beach).

Rysun Biotechnology changes the game.
To ensure sunscreen is used when it should be (daily), we engineer compliance into the formula:

• Invisible Finish: Using advanced dispersion technology, we eliminate the white cast.
• Serum-Like Texture: We create SPFs that absorb in seconds, acting as a perfect makeup primer.
• Strict QC: Our 50 inspection procedures ensure that these complex, lightweight formulas maintain their SPF rating over time, so the daily protection never wavers.

Conclusion

So, when sunscreen should be used?
It should be used in the morning, 365 days a year, rain or shine, indoors or outdoors.

At Rysun Biotechnology, we combine over 10 years of manufacturing excellence with Swiss-inspired precision. We create sunscreens that are so elegant and effective that your customers won't ask when to use them—they will want to use them every morning. Partner with us to manufacture the ultimate daily defense.

FAQs

Q1: At what step in my routine should sunscreen be used?
A: It should always be the last step of your skincare routine, after moisturizer and before makeup. This ensures the protective film is unbroken.

Q2: Do I need to reapply if I am indoors all day?
A: If you are sitting away from windows, a morning application is usually sufficient. However, if you sit by a window or go out for lunch, Rysun recommends a touch-up (perhaps with a mineral powder SPF) midday.

Q3: When should sunscreen be used on babies?
A: Pediatricians recommend keeping babies out of direct sun until 6 months. After 6 months, a mineral sunscreen (Zinc Oxide) should be used whenever they are outdoors. Rysun manufactures specialized, ultra-gentle baby formulas.

Q4: Should I use sunscreen at night?
A: No. Your skin needs to breathe and repair at night. Use a dedicated Night Cream with Retinol or Peptides (which Rysun also manufactures) instead of SPF while you sleep.