Hey there, welcome to Paging Dr. Gupta. This is the place where we tackle the questions that matter the most to you. We're starting to build an amazing community and I love hearing from you. I love hear about your daily lives. Your voice, your experience, your genuine concern, that's what brings this show to life. Okay, Kyra is back with us. What's our first question?

Hey Sanjay, so first up today, we actually have a question coming from Detroit, which is not far from both of our hometowns. And she's calling about hair and skin. Now, when I moved to New York, I actually noticed a change in mine and invested in exactly what she's calling about today. So selfishly, I too am curious if it actually helps. Let me play Rebecca's question for you.

Hi, Sanjay my question is, do shower head filters actually help? And is there any evidence base that it's better for your hair and skin? Thank you.

Okay, Rebecca, a great question, and Kyra, you're quite right this is something that I've thought about a lot as well. So first of all, let me just start with the statistic, 85% of American homes have what is known as hard water. What does that mean? It means that they have high levels of dissolved minerals, specifically calcium and magnesium. And that's exactly where showerhead filters claim to help. So, the question is, do they actually make a difference for your hair or your skin? We'll talk about it after the break.

'Okay Rebecca, showerhead filter, do you need one? First of all, I have to say that I've thought about this a lot as well. Sometimes I travel and I'll feel like my skin and my hair look and feel different when I'm showering in other locations versus at home. And I've often wondered if that was the water or the various products that I was using. I decided to call up one of our experts for this question, Dr. Marisa Garshick. She is a board-certified dermatologist and fellow of the American Academy of Dermatology. This is what she told me.

So the reason showerhead filters exist is to actually help to eliminate concerns with hard water. And so that may mean that the water has a high mineral content, and then that specifically usually refers to magnesium and calcium, but there's also water that can have a high chlorine content, which as most people who are familiar with swimming, chlorine is not great for your skin. And what we know about hard water is that when you use it as part of taking a shower or bathing, sometimes it doesn't effectively allow your shampoo or your soap to lather sufficiently. And then oftentimes it can leave a residue behind and leave the skin more susceptible to dryness and irritation. Similarly for hair, people may notice more dryness or dullness or even like brittleness.

So, showerhead filters are designed to reduce things like chlorine and again certain minerals that I mentioned already. That's the stuff that can leave behind residue and often interferes with how your hair and skin might feel. But does it really make a difference?

So I would say there is some truth to it and there is some evidence to it, but it doesn't necessarily mean changing your shower head filter is going to cure all your skin ailments and even for people who have maybe eczema or certain skin conditions, it's definitely one piece of a bigger kind of puzzle in terms of the treatment approach. I've definitely had a number of patients who after having made a change or purchasing a shower head filter, come back and say, wow, that really did make a difference. But sometimes it's hard to know because it's at the same time that they're doing other things and they're maybe paying more attention to their skin overall. But I do think that for certain people, it can make a meaningful difference.

Okay, so there may be benefits. Science isn't definitive yet. As we've talked about in earlier podcasts, sometimes that science is hard to accumulate. It is worth noting that filtered showerheads are not regulated by the EPA, which means marketing claims are not always verified. So then the big question is, should you actually try one?

In general, if you're somebody who is experiencing dry, sensitive skin, you feel like you've tried all the different things. You're doing the moisturizing creams, you have a humidifier, but you're still experiencing it, and you feel you've noticed a difference based on the way the water is affecting you, I think go for it. But they sometimes can be costly, and I don't want people to feel like without them, there's no way to care for their skin in a way that's meaningful and can help to improve their overall quality of skin. So I think it's a compliment to other things that we have, but it shouldn't replace quality skincare, gentle cleansers, and basically, I always say showers are a big part of what we do to our skin. So short showers once a day, 5, 10 minutes, lukewarm water, moisturizing the skin, can all play a big role. And so doing all those things before you feel like you need to switch the showerhead may be helpful.

'Okay, so if you're thinking about trying a showerhead filter, the key is to figure out what exactly you're trying to filter out and making sure the product is actually designed to do that. So, for example, if you are concerned about chlorine, look for filters that use KDF-55. That can reduce chlorine even if it doesn't completely remove it. Can also remove some of the heavy metals if they are present in your water. Also, consider brands that test their products against the National Sanitation Foundation's 177 standard. That will certify whether a showerhead actually reduces chlorine. Alright, Rebecca, hope that helps. I learned something here as well. We got another question...Kyra go ahead!

Okay, so our next question is on LED face masks. These seem to be everywhere right now. Influencers love them, people swear by them, but a lot of us are left wondering whether they actually can do what they claim.

Yes, LED face masks. They really seem to have come out of nowhere and gained ton of popularity. The big question is, what is the science behind them? Is this just another fad? We'll talk about it, right after the break.

Okay, there's the pager, let's hear the question.

Hi Dr. Gupta, my name is Scott and I had a question about the LED light masks that are very popular. Is there scientific or medical proof that they really can do what they say such as a red light helps smooth fine lines and boost collagen and purple light helps tighten pores and relaxes the skin and so forth? Thank you.

'Scott, great question. No doubt, LED light therapy has gotten a lot of attention over the last couple of years. Dermatology offices, medical spas, there are even in-home devices that you can use on your couch. But as always, here on Paging Dr. Gupta, we try to figure out what is the real science behind the claims. So Dr. Garshick is back, she's a dermatologist, and this is what she had to say.

'So when you have an LED light, it's releasing a certain amount of light energy and that's targeting a certain wavelength. And wavelengths actually can pick up at certain levels in the skin. The greater the wavelength, the deeper it penetrates. And so that's why red light actually is good for collagen because it's going deeper into the skin and that's helping to support that collagen process. That's good for skin texture, helps with firming the skin, fine lines, wrinkles. And we call it like photobiomodulation, so it's essentially creating a difference in the skin using this light-based energy. At the more superficial level is where blue light has more of an impact and that's working as an anti-inflammatory, reducing inflammation in the skin and also helping to fight those acne-causing bacteria, which is why for some people, this can be a great option, especially for acne treatment as well.

'So let me just repeat that. Red light goes deeper. So that means it's gonna stimulate collagen, potentially improving texture and fine lines. Blue light, that's gonna work closer to the surface, can help calm inflammation and target acne-causing bacteria. Now, Scott, you also mentioned purple light. And a lot of these masks advertise green, yellow, even orange. So what about those?

'The most well-studied from sort of a dermatology perspective and certainly what we utilize most in office is going to be in that red and blue light phase. Now, there is some value to some of these other kind of wavelengths. Certainly there are anti-inflammatory benefits, skin brightening benefits, even with like the yellow lights and sometimes people will find maybe that one helps more with pigmentation and whatnot of the skin. But I would say big picture, I do find red and blue light tend to be the ones that we reach for the most in terms of finding significant benefits from there.

Okay, I need to jump in really fast because what about people with like freckles or sensitive skin? Like when do we need to be cautious?

'Yeah, Kyra, great point. So for people with freckles or darker pigmentation, Dr. Garshick says these masks aren't designed to erase pigment or get rid of dark spots. Very important. She mentioned that sometimes just by evening out skin tone, you might see some subtle changes, but they're not going to make freckles disappear. They're not gonna make age spots disappear either. Now, where you do want to be more careful is with certain skin conditions. So, for people with something known as melasma, for example, that's a form of hyperpigmentation, the heat generated by some of these masks can actually trigger or worsen it. Ok, so keep that in mind. Doesn't happen to everyone, but it's something you want to talk about with your dermatologist before using one. Same goes for people who have very sensitive skin, eczema, or rosacea. In some situations, the blue light's anti-inflammatory effects can be helpful, but again, the heat from the device can sometimes cancel out those benefits. Also in case you've had a history of skin cancer, the good news is these devices should not have a negative effect. So putting it all together, are they worth it?

'The LED masks definitely have some scientific evidence behind them, but what's interesting about the at-home devices is that the amount that we're able to deliver in an at-home device safely differs from what we can do in the in-office setting. So even though the scientific basis is definitely there, it's important to know that when you're doing it at home, you are getting a more modified impact. For somebody who is interested, I think they're certainly reasonable. But I don't find them to be something that will replace doing injectables or lasers or replace wearing sunscreen every day and the benefits that that can do for your skin in terms of skin aging. But the biggest thing and one of the things I always have to tell my patients is that it's only gonna work if you use it. And so it's really intended to be something that if you're gonna invest in it, you really feel comfortable that you'll be able to be consistent because that's really where you'll see the most impact.

'So Scott, some real science behind red light and blue light therapy, but the result of the at-home treatments do tend to be more gradual and subtle as compared to in-office treatments. I guess that should be no surprise. If you're willing to use them consistently, they can be a reasonable addition to your routine. And if you do decide to try one, look for a device labeled FDA cleared, be consistent, again, about wearing the mask and following the instructions that come with it. It's usually about 10 minutes a day, 5 days a week. Protect your eyes, very important. And again, talk to your dermatologist first, especially if you have melasma, eczema, or other sensitive skin conditions.

'Okay, that's a wrap for today's episode. Thanks so much to everyone who sent in questions. This show wouldn't exist without you. I'm really glad you're a part of it. Thanks to our expert as well for weighing in. And remember... No question is too big or too small or too embarrassing. We might just answer it on our next show. Record a voice memo, email it to pagingdrgupta@cnn.com, that's paging dr gupta at cnn.com or give us a call, 470-396-0832, and leave a message. Thanks so much for listening.