All things SPF
May 15, 2026
Can You Use Diaper Rash Cream as Sunscreen? A Lab-Tested Answer.
Diaper rash cream has zinc oxide. So does sunscreen. The active ingredient is the same. But using diaper rash cream as sunscreen...
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May 14, 2026
Seed Oils Have No Meaningful SPF. Here's What the Data Shows.
A claim that will not die: raspberry seed oil has an SPF of 28 to 50. It shows up in DIY sunscreen...
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May 13, 2026
UVA Fades Tattoo Ink. Zinc Oxide Blocks UVA.
UV radiation breaks down tattoo ink. This is the same photodegradation that happens to any organic pigment exposed to UV light, occurring...
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May 10, 2026
Mineral Sunscreen and Body Hair: Why the White Cast Happens and How to Fix It
Most mineral sunscreens turn chest and back hair white. Here is why it happens, which ingredients are responsible, and what the formula...
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May 07, 2026
Iron Oxides in Sunscreen: The Blue Light Protection Some Formulas Skip
Iron oxides in sunscreen absorb high-energy visible (HEV) light, commonly called blue light, in addition to providing the tint that neutralizes white...
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May 05, 2026
Reef-Safe Isn't Regulated. The Ingredient List Is.
"Reef safe" is not a regulated term in the United States. Any brand can print it on any product, regardless of what's...
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May 04, 2026
UV Damage Accumulates Every Day, Not Just at the Beach.
Yes, UV radiation causes cumulative skin damage every day, not just at the beach or in summer. UVA rays, which penetrate clouds...
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May 02, 2026
Chemical vs. Mineral Sunscreen: What the FDA Says
The most important difference between chemical and mineral sunscreen is not the mechanism, it is what the FDA has confirmed about each...
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May 01, 2026
Colorado UV Index: Why Sun Protection Is Non-Negotiable at Altitude
Colorado's UV index regularly hits 11 or higher, among the highest in the contiguous United States, because elevation reduces the atmosphere that...
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