Episode 379 - Wonder Water, Product Dupes, Sunscreen layering and more

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On today’s show we cover lots of questions including…
• Can layering sunscreens make them less effective?
• Why can’t you use L’oreal wonder water on your scalp?
• What’s the history of using blue light to treat acne?
• Is it damaging to use a pre-treatment on hair?
• When can you call a formula a “dupe”?
Beauty News
The Beauty Brains were on the Pretty Curious podcast (overcast.fm/+ABGubSBhFuE).
Approximate timestamps
0:00 Chit chat - Pretty Curious podcast, Thailand, Lip problems
7:40 Vitamin C derivatives follow-up
13:20 Sunscreen layering question
19:45 Wonder water on your scalp
23:45 Blue light treating acne
27:40 Pre-treatment and hair damage
33:20 Product dupes
36:45 Difference between men and women's products
38:25 Using hypochlorous acid on skin
40:00 How long to wait between skin product applications
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