Which Beauty of Joseon sunscreen do you mean?

Beauty of Joseon sells several sunscreens, so the brand name is not an ingredient list, however convenient that would be. Its Canadian storefront lists Relief Sun: Rice + Niacinamide SPF 50+ PA++++, Relief Sun Aqua Fresh: Rice + B5 SPF 50+ PA++++, and Daily Tinted Fluid Sunscreen SPF 30, among others. Start with the exact product and market version on your bottle rather than treating the whole range as one formula.2

What about the zinc oxide sunscreen?

The UK and EU Daily Tinted Fluid Sunscreen in shade LP100 lists 20.90% zinc oxide. Its full ingredient list contains neither oxybenzone nor octinoxate. If avoiding those two ingredients is your specific requirement, that formula meets it. Do not extend that ingredient list to Relief Sun, Relief Sun Aqua Fresh or another market version. Daily Tinted Fluid has its own formula, even if sharing a brand name makes the bottles look like they have agreed on everything.3

Why do oxybenzone and octinoxate come up?

Questions about oxybenzone and octinoxate affecting coral prompted FDA environmental review planning for sunscreens containing them. Avoiding those ingredients answers a narrow ingredient question, not the broader question of how an entire sunscreen affects a reef. Research on sunscreen ingredients and coral has included tests criticized for unrealistic environments and concentrations.14

How should you choose sunscreen for swimming?

  1. 1Identify the exact Beauty of Joseon product and market version, then read that bottle's ingredient list.
  2. 2Choose broad spectrum protection, SPF 30 or higher, and water resistance. SPF measures protection against sunburn; water resistance tells you how long protection lasts on wet skin.
  3. 3Follow the water resistance timing on the label. In the US, the tested designations are 40 or 80 minutes. Reapply after toweling off and every two hours outdoors even when your skin stays dry.
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Use shade and sun protective clothing alongside sunscreen, because no sunscreen filters out all UVB rays. For a swimming purchase, look for an explicit water resistance designation rather than using "reef safe" as a substitute.1

Where this answer comes from

  1. 1How to decode a sunscreen labelaad.org
  2. 2Beauty of Joseon Sunscreensca.beautyofjoseon.com
  3. 3Daily Tinted Fluid Sunscreenca.beautyofjoseon.com
  4. 4Environmental Impact Statement (EIS) for Certain Sunscreen Drug Products​fda.gov