Dermatologist's Sunscreen Update 2021: UVA vs UVB & Should we get Vitamin D from the Sun?
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- čas přidán 23. 03. 2021
- Love healthy skin AND love the sun? This video is for I'm the first to admit that being in the sun has amazing benefits on our mood. The warmth from infrared rays feels so good on our skin and being outside in the fresh sunshine has a huge impact on our emotional well being. But, those benefits come at a cost to our skin health, so it's all about balance. I'm here to empower you with knowledge so you can love your skin AND the sun!
Let's dive in with UV light. It's a known human carcinogen. It causes DNA damage and skin cancer. It also accounts for most of the signs of aging that you see on the skin: fine lines, wrinkles, brown spots, loss of elasticity.
Being in the sun has some amazing benefits- the warmth from infrared rays feels so good on our skin, and being outside in the sunlight has a huge impact on our mood and our emotional well being.
The UV rays you need to worry most about are UVB and UVA.
UVB has shorter wavelengths that don’t penetrate very far into the skin, but they do major damage. UVB = think B for BURN, contributes to sunburn, skin cancer and precancers, but also contributes to vit D synthesis (more on that later).
UVA has longer wavelengths which penetrate deeper into your skin. Think "A" for aging breakdown of collagen fine lines, wrinkles.
BOTH UVA and UVB contribute to CANCER
Both dampen, or diminish your skin’s immune response. That can be a GOOD thing and can be a BAD thing.
Obviously, if you have a weakened or dampened immune system you’re more susceptible to infection but you’re also more susceptible to skin cancer- the immune system plays a major role in preventing cancer cells from developing in the skin. Dermatologists know that patients who have an organ transplant, and are on immunosuppressive therapies to prevent them from rejecting their organs, are MUCH more likely to get skin cancer. Well, UV rays are immunosuppressive, so not only do they cause the DNA damage that leads to skin cancer but they also prevent your own immune system from stopping those cancer cells from multiplying.
Now a dampened immune system can actually be HELPFUL in certain skin conditions. Classic example is psoriasis- where the immune system in the skin is OVER reacting. Psoriasis patients know their skin gets better in the summer or on vacation at the beach. Some acne patients may notice their acne improves over the summer months- and part of that is because the immune system is dampened. Unfortunately, while a skin condition might improve with the sun, your risk for skin cancer and aging increases at the same time, so again, there’s that balance.
Now, let's turn to Vitamin D. This is a question I get ALL the time:
“Dr. Bowe, don’t I need some sun exposure to get my vitamin D? And isn’t the vitamin D you get from the sun the best kind?”
There’s no SAFE way to get vit D from the sun. Your skin does produce vit D, but to do so, it requires UVB exposure- UVB is a known carcinogen, so you can’t get your skin to produce vit D without doing DNA damage and increasing your skin of skin cancer.
Acc to the latest studies: sunscreen use does not cause vit D deficiency
(ref: pubmed.ncbi.nlm.nih.gov/9418761/)
The amount of UVA in sun exposure can IMPAIR vit D synthesis in the skin. So UVB can activate it, but UVA degrades it. Vit D is exquisitely sensitive to sunlight! Once it’s produced in the skin, if you STAY in the sun- the sun breaks it down! So in winter, when you have more uva than uvb (like on a cloudy day or when you’re at home near a window), exposure to sunlight is actually more likely to break down the vit D in your skin than it is to trigger new vit D production.
(ref: pubmed.ncbi.nlm.nih.gov/19155...)
In my opinion, we should be getting Vitamin D through diet. Talk to your doctor about dose, but don’t justify your sun exposure by saying you’re getting your vit D.
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how about get vit D from UVB lamps?
What are your thoughts on Tula sunscreen?
Very informative! So it’s pretty important to wear sunscreen at home too! Thank you Dr. Bowe!
I takes sunscreens every day. Rather inside/outside it’s important to used sunscreen every. Some people thinks you don’t need it but honestly you do needs for skin/beauty routine. I used multiple sunscreens. I not sorry about it all.
How dangerous do you think it would be to spend, let's say 8 minutes per day in front of the Sperti Vitamin D (UV-B) Lamp? This is marketed as the only FDA-approved lamp for this purpose. There are studies in Pubmed. Thanks!
Wow. Subscribing right away. I'm Black and quite worried these days because I learnt about sunscreens late last year and surprised it's controversial in the Black community. Thank you for this!
U need to check out Dr.Anna Brown on melanin and Dr.Carol Barnes/Dr. Laila Afrika.Copper color melanin family don't need any sunscreen.I sit in the sun 🌞🌞🌞🌞 for 4 hour with my feet in soil with a book r love music.
Pls talk about natural vit d from diet rather than supplements
Awesome information!! ☀️😎
in the winter or on a cloudy day when ur getting more UVA than UVB then possibly more D is breaking down than being made- So not good. And hence why diet more important than in summer. However on sunny days and in summer when you can make more D from UVB than is broken down by the UVA, then as long as you limit your exposure to less than when you burn you can indeed keep your D levels up.
Good info but ..does that mean without supplements, we have to choose between skin cancer or deficiency?
This is so bs I was able to raise my vitamin d levels quicker with sun exposure. I did 30 -40 min sessions 3 to 4 times a week.
I takes vitamin d from multi supplement, foods, and drinks. So there are options.
Absolutely agree!
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Can you comment on lrp tinted mineral spf 50? Is it a good spf sense it contains only 11% titanium dioxide, no zinc?
It states broad spectrum but i worry that it doesn’t cover uva 1 rays and i am getting damage i cant see for a few years!
@@lism2164 I don’t know if it helps you make a decision, but it’s not available in countries where the broad spectrum laws are stricter. It doesn’t satisfy the uva requirements in Australia or the EU.
Don't understand a damm thing , please explain in easy language
That is one of the funniest things I've read in a while. 😆