This comparison covers Round Lab's SPF 45+ PA++++ UVLock lotion, not its mineral SPF 50+ sunscreen or its sunscreen serum. Round Lab sells several Birch sunscreen formats, so 'the birch one' leaves the shopping list doing unpaid detective work.2
What should you compare on the two tubes?
| Detail | Round Lab Birch Juice UVLock lotion | Beauty of Joseon Relief Sun |
|---|---|---|
| Protection | SPF 45+ PA++++; broad spectrum | Check the exact tube's SPF and UVA rating. |
| Filters | Chemical UV filters | Check the ingredient list for your version. |
| Hydrating ingredients | Birch sap, hyaluronic acid and glyceryl glucoside | Check the complete formula. |
| Other ingredients | Niacinamide and panthenol | Check the complete formula. |
| Texture | Lightweight lotion with a smooth finish | Compare the exact version's texture before choosing. |
| Size and price | 50 ml; price not established | Compare current prices for the same volume. |
| Directions | Use the tube's directions alongside general sunscreen guidance. | Use the tube's directions alongside general sunscreen guidance. |
Who should choose Round Lab?
Round Lab positions UVLock for all skin types, including oily and combination skin, with hydration for dry skin and a smooth finish under makeup. Its appeal is a lightweight lotion rather than a thick sunscreen layer, because a morning routine already has enough opportunities to become an administrative task.1
If chemical sunscreens have caused stinging or flushing, do not choose UVLock solely because it is hydrating. Round Lab's mineral Birch Juice sunscreen is a different formula. After a laser treatment or peel, confirm your sunscreen choice with the clinician providing your care.2
How do you use either sunscreen?
These are general sunscreen steps, not separate product label directions.
- 1Apply sunscreen before going outdoors. Allow approximately 15 minutes before sun exposure rather than applying it once you are already outside.
- 2Apply enough and rub it thoroughly into the skin. General dermatology guidance specifies at least 1 teaspoon for the face and about 1 ounce for an adult's exposed skin, with more needed depending on body size.
- 3Cover exposed areas beyond the face, including the neck and ears. A face sunscreen comparison does not make those areas optional.
- 4Reapply every two hours outdoors and immediately after swimming or sweating.
What about swimming or a long day outside?
Choose a sunscreen explicitly labelled water resistant if you will swim or sweat; do not infer water resistance from SPF or texture. Reapply after towel drying or rubbing the sunscreen off. Use clothing and shade as well, and do not extend your time in the sun because you are wearing sunscreen.4
