DOCSLIB.ORG

Facts and Myths: Ultraviolet Light and Sun Protection

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Facts and Myths: Ultraviolet Light and Sun Protection Facts and Myths: Ultraviolet Light and Sun Protection Katherine T. Steele, MD Assistant Professor of Clinical Dermatology University of Pennsylvania Fundamentals: Ultraviolet light Sunlight consists of 2 types of ultraviolet (UV) light • UVA • UVB • UVC (absorbed by the ozone in the earth’s atmosphere) Fundamentals: Ultraviolet light UVA rays • Premature aging – Dark spots – Wrinkles – Loose skin UVB rays • Sunburn Both UVA + UVB • Skin cancer Sun Protection: Facts What is the most effective way to protect your skin from the sun? 1) Avoiding sun exposure 2) Sun-protective clothing 3) Sunscreen Sun Avoidance UVB intensity peaks from 10 AM to 2 PM Note: UVA intensity is relatively constant throughout the day Avoid Peak Hours 6 AM 10 AM 2 PM 8 PM Which is the most effective way to protect your skin from the sun? 1) Avoiding sun exposure 2) Sun-protective clothing 3) Sunscreen Sun-protective clothing with UPF (ultraviolet protection factor) Benefits of sun-protective clothing • Once garment is on, it starts working immediately • Won’t wear off throughout the day • Not messy, oily or greasy • Non-allergenic • Potential cost savings: garments last many seasons • Created for Leisure and Sporting activities • Fashionable and trendy https://yoursummerskin.com/pages/about-upf-clothing Sun-Protective Clothing Sun Threadz Colleen Dougherty Bronstein Supporter of Melanoma Program at the Abramson Cancer Center of the University of Pennsylvania Which is the most effective way to protect your skin from the sun? 1) Avoiding sun exposure 2) Sun-protective clothing 3) Sunscreen Sunscreen: Facts Sunscreen labeling Broad-spectrum = Provides protection against both UVA + UVB Only broad-spectrum sunscreens with SPF 15+ can claim to reduce the risk of skin cancer and early skin aging. Water resistant: must specify if provides protection for 40 or 80 minutes The terms “waterproof” “sweatproof” and “sunblock” can no longer be used. Sunscreen Products Sunscreen Lotions: Top-Rated by Consumer Reports La Roche-Posay Anthelios 60 Melt-In Sunscreen Milk ($27) Equate Sport Lotion SPF 50 ($12) Pure Sun Defense Disney Frozen Lotion SPF 50 ($6) Coppertone WaterBabies Lotion SPF 50 ($12) Equate Ultra Protection Lotion SPF 50 ($10) Sunscreen Sprays: Top-Rated by Consumer Reports Trader Joe's Spray SPF 50+ ($6) Banana Boat SunComfort Clear UltraMist Spray SPF 50+ ($10) Equate Sport Continuous Spray SPF 30 ($4.98) Note: Use spray sunscreens carefully. The FDA is investigating potential risks associated with inhaling spray sunscreens, so use caution in children and avoid spraying directly on face. Sunscreen Tips Use a sunscreen with the highest SPF that you like using Apply sunscreen 15-30 minutes before you go outside Reapply at least every 2 hours. Reapply after swimming and sweating. Most people only apply 25% to 50% of the recommended amount of sunscreen. Apply liberally! Use at least 1 ounce, enough to fill a shot glass. Fact or Myth: Rigorous sun protection can cause vitamin D deficiency. 1) Fact 2) Myth Vitamin D Sources People who protect themselves from the sun by seeking shade or wearing sun-protective clothing may be at risk for vitamin D deficiency. However, UV rays can cause skin cancer, so we do not recommend getting vitamin D from sun exposure. Better alternative: • Healthy diet including foods rich in vitamin D • Vitamin D supplements. Recommended Daily Amount of Vitamin D = • For Ages 1-70: 600 IU • For Age > 70: 800 IU Fact or Myth: If you stay under a beach umbrella, you don’t need sunscreen. 1) Fact 2) Myth Sand reflects 25% of UV rays Snow reflects 80% of UV rays. A 2017 study in JAMA Dermatology: Nearly 80% of people who sat under a beach umbrella without sunscreen got a sunburn compared to 25% of people who stayed out in the sun and used a high SPF sunscreen. You still need to wear sunscreen and sun protective clothing if you’re relaxing under an umbrella on the beach. Fact or Myth: If it’s cloudy outside, you don’t need sunscreen. 1) Fact 2) Myth On a cloudy day, up to 80% of the sun’s UV rays can pass through the clouds. Clouds may take away the “warming warning”. You can still get sunburned on a cloudy day! Fact or Myth: The front windshield and side windows of a car block 95% of UVA rays. 1) Fact 2) Myth UVB rays are blocked by window glass. UVA rays can pass through windows. Windshields provide consistent protection Block 95+% of UVA rays Side windows are quite variable Block 45-95% of UVA rays Fact or Myth: All sunscreens cause damage to coral reefs. 1) Fact 2) Myth Beginning Jan 1st 2021, the legislation will prohibit the distribution of sunscreens containing the chemicals oxybenzone and octinoxate, which may contribute to coral bleaching when washed off in the ocean. Recommendations for sun protection when swimming near coral reefs: 1) Avoid swimming at peak hours (10AM- 2PM) 2) Wear sun-protective clothing / rash guard 3) Use a sunscreen with zinc oxide or titanium dioxide (not harmful to coral reefs) Sun Protection Sun avoidance is the most effective way to protect your skin from the sun. • Avoid peaks hours 10AM-2PM Sun-protective clothing provides immediate and long-lasting protection. Sunscreens are an important component of sun protection. • SPF 30+, broad-spectrum, water-resistant • The best sunscreen is the one you will use! Thank you! Questions?.
Load more

Recommended publications
  • Report of the Advisory Group to Recommend Priorities for the IARC Monographs During 2020–2024
    IARC Monographs on the Identification of Carcinogenic Hazards to Humans Report of the Advisory Group to Recommend Priorities for the IARC Monographs during 2020–2024 Report of the Advisory Group to Recommend Priorities for the IARC Monographs during 2020–2024 CONTENTS Introduction ................................................................................................................................... 1 Acetaldehyde (CAS No. 75-07-0) ................................................................................................. 3 Acrolein (CAS No. 107-02-8) ....................................................................................................... 4 Acrylamide (CAS No. 79-06-1) .................................................................................................... 5 Acrylonitrile (CAS No. 107-13-1) ................................................................................................ 6 Aflatoxins (CAS No. 1402-68-2) .................................................................................................. 8 Air pollutants and underlying mechanisms for breast cancer ....................................................... 9 Airborne gram-negative bacterial endotoxins ............................................................................. 10 Alachlor (chloroacetanilide herbicide) (CAS No. 15972-60-8) .................................................. 10 Aluminium (CAS No. 7429-90-5) .............................................................................................. 11
    [Show full text]
  • Safety of Oxybenzone: Putting Numbers Table
    Safety of Oxybenzone: Putting Numbers Table. Years of Daily Sunscreen Application Required by an Average US Woman to Reach Systemic Levels Into Perspective of Oxybenzone per Unit of Body Mass Equivalent to Those Given to Immature Rats10 xybenzone, an organic UV-B and short-wave UV-A filter, has been available for over 40 years1; Scenario Scenario Scenario it is widely used in sunscreens and other con- Characteristic 1 2 3 O 2 sumer products in the United States. The Centers for Dis- Body surface area covered, % 100 100 25 ease Control and Prevention has estimated the preva- Application dose, mg/cm2/d211 lence of oxybenzone exposure in the general US Application amount required, 30.00 15.00 3.75 population to be 96.8%.3 In the past few years, oxyben- mL/d Time required, y 34.6 69.3 277.0 zone has received increasing attention as a potentially harmful compound. Initial concerns arose when a re- port demonstrated systemic absorption of oxybenzone in humans at a rate of 1% to 2% after topical applica- For the purposes of this estimation, a generous in-use dose of 1 mg/cm2 was used,13-16 and it was assumed that cov- tion.4 Similar or higher rates of cutaneous absorption in 5-9 erage of 25% of the human BSA was limited to the face, human subjects have been observed. The potential for neck, hands, and arms.17 biological effects, however, were first published in a study 10 by Schlumpf et al demonstrating uterotropic effects in Results. The numbers of years of daily application re- immature rats after oral administration of oxybenzone; quired to obtain the equivalent amount of sunscreen un- it should be noted that the estrogenic effect detected was der the 3 scenarios are listed in the Table.
    [Show full text]
  • May 23, 2007 Office of Pesticide Programs
    May 23, 2007 Office of Pesticide Programs (OPP) Regulatory Public Docket (7502P) Environmental Protection Agency 1200 Pennsylvania Ave., NW Washington, DC 20460-0001 RE: Insect Repellent-Sunscreen Combination Products [EPA-HQ-OPP-2007-0087] Beyond Pesticides appreciates the prudent contemplation of insect repellent-sunscreen combination products EPA proposed in the reregistration eligibility decision (RED) for N,N-diethyl-meta-toluamide (DEET). We also appreciate this opportunity to share our concerns over these products. Beyond Pesticides interest in this issue lies in our effort to restrict pesticide use in a manner that protects public health and the environment, and to advance alternatives that eliminate dependency on toxic chemicals. We oppose the reregistration of all DEET-sunscreen combination products for the following reasons: 1. DEET exposure can result in negative health effects. As the agency notes, the registration of DEET is unusual in that it is one of few residential-use pesticides that is applied directly to the skin. The result is that the public is being exposed to a pesticide that has the ability to cause in lab animals increased fetal loss, bone and skeleton abnormalities in the offspring of rabbits, birth defects in birds, reduction in size of the testes and degeneration, and has produced abnormal sperm with reduced motility. Additionally, the public is directly applying a chemical to their skin that is demonstrated to cross the placenta and move into fetal blood in humans, has the ability to cause mutagenicity and oxidative stress, can decrease sensory and motor skills, causes skin irritation and kills brain cells.1 2. Sunscreen exposure can result in negative health effects.
    [Show full text]
  • GAO-18-61, SUNSCREEN: FDA Reviewed Applications For
    United States Government Accountability Office Report to Congressional Committees November 2017 SUNSCREEN FDA Reviewed Applications for Additional Active Ingredients and Determined More Data Needed GAO-18-61 November 2017 SUNSCREEN FDA Reviewed Applications for Additional Active Ingredients and Determined More Data Needed Highlights of GAO-18-61, a report to congressional committees Why GAO Did This Study What GAO Found Using sunscreen as directed with other The Food and Drug Administration (FDA), within the Department of Health and sun protective measures may help Human Services, implemented requirements for reviewing applications for reduce the risk of skin cancer—the sunscreen active ingredients within time frames set by the Sunscreen Innovation most common form of cancer in the Act, which was enacted in November 2014. For example, the agency issued a United States. In the United States, guidance document on safety and effectiveness testing in November 2016. sunscreen is considered an over-the- counter drug, which is a drug available As of August 2017, all applications for sunscreen active ingredients remain to consumers without a prescription. pending after the agency determined more safety and effectiveness data are Some sunscreen active ingredients not needed. By February 2015, FDA completed its initial review of the safety and currently marketed in the United States effectiveness data for each of the eight pending applications, as required by the have been available in products in act. FDA concluded that additional data are needed to determine that the other countries for more than a ingredients are generally recognized as safe and effective (GRASE), which is decade. Companies that manufacture needed so that products using the ingredients can subsequently be marketed in some of these ingredients have sought the United States without FDA’s premarket approval.
    [Show full text]
  • Part 1. Myths and Facts About Sun Protection in Pediatric Population
    Welcome to “Myths and Facts about Sun Protection in Pediatric Population”, a podcast made for PedsCases.com at the University of Alberta. I am Dr. Harry Liu, a dermatology resident at the University of British Columbia, and I am Jennifer Ling, a fourth-year medical student at the University of British Columbia. This podcast will talK about different methods of sun protection in the pediatric population and we hope to present evidenced based recommendations on sun protection that you can share with patients. We would liKe to thanK Dr. Miriam Weinstein and Dr. Conor Mulholland for developing this podcast with us. Dr. Weinstein is a pediatric dermatologist in Toronto at the Hospital for SicK Children (SicKKids). Dr. Mulholland is a pediatric ophthalmologist at the BC Children’s Hospital in Vancouver. This podcast will be followed by another one that will discuss about pigmented sKin and eye lesions as well as cutaneous and ocular melanoma in the pediatric population. 1 After listening to this podcast, we expect the learner to be able to: • Describe the properties of UV light and its effects on the sKin and eyes • List different methods of sun protection • Discuss how to effectively educate patients about sun protection • Outline the initial steps in managing a sunburn (there was no financial support or any conflict of interests for the development of this podcast) 2 First, we’d liKe to present a case. It is your first day at an urban pediatric clinic as a third-year medical student. Your first patient (Lucy) is a 16-year-old girl who is in the clinic with her mother for annual check-up.
    [Show full text]
  • Two-Step Semi-Microscale Preparation of a Cinnamate Ester Sunscreen Analog W
    In the Laboratory edited by The Microscale Laboratory R. David Crouch Dickinson College Carlisle, PA 17013-2896 Two-Step Semi-Microscale Preparation of a Cinnamate Ester Sunscreen Analog W Ryan G. Stabile and Andrew P. Dicks* Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada, M5S 3H6; *[email protected] Several laboratory experiments concerning the physical A two-step procedure using 4-methoxybenzaldehyde as properties of sunscreens have appeared in this Journal dur- the starting material (Scheme I) synthesizes ethyl trans-4- ing the last decade (1–5). These include quantification of methoxycinnamate 1. In the first laboratory session students commercial formulations by liquid chromatography (1) and are exposed to an important carbon–carbon bond forming ultraviolet (UV) spectrophotometry (2–4). The photochem- condensation reaction. The Verley–Doebner modification of istry of sunscreens has also been reviewed (6). Significantly, the Knoevenagel condensation (11) affords facile synthesis a student procedure focusing on multistep sunscreen synthesis of trans-4-methoxycinnamic acid, which is isolated and char- and spectroscopic analysis has not, to our knowledge, been acterized. During the second period, esterification is effected reported. Given the current high profile nature of skin can- by a cesium base mediated O-alkylation approach. This ex- cer (7) and media attention towards sunscreens, we designed emplifies the so-called “cesium effect” (12) and the useful- a two-step synthetic pathway towards an analog of a com- ness of cesium carboxylates as nucleophiles in SN2 reactions. mercially available UV light blocker. This methodology is in- In addition to stimulating class enthusiasm towards syn- corporated into a third-year undergraduate organic synthesis thetic chemistry, this experiment impresses many organic course at the University of Toronto.
    [Show full text]
  • Ultraviolet Radiation, Aging and the Skin: Prevention of Damage by Topical Camp Manipulation
    Molecules 2014, 19, 6202-6219; doi:10.3390/molecules19056202 OPEN ACCESS molecules ISSN 1420-3049 www.mdpi.com/journal/molecules Review Ultraviolet Radiation, Aging and the Skin: Prevention of Damage by Topical cAMP Manipulation Alexandra Amaro-Ortiz 1, Betty Yan 1 and John A. D’Orazio 1,2,* 1 The Graduate Center for Toxicology, the Markey Cancer Center and the Department of Pediatrics, University of Kentucky College of Medicine, 800 Rose Street, Lexington, KY 40536, USA 2 Markey Cancer Center, University of Kentucky College of Medicine, Combs Research Building 204, 800 Rose Street, Lexington, KY 40536-0096, USA * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +1-859-323-6238; Fax: +1-859-257-8940. Received: 26 April 2014; in revised form: 8 May 2014 / Accepted: 13 May 2014 / Published: 15 May 2014 Abstract: Being the largest and most visible organ of the body and heavily influenced by environmental factors, skin is ideal to study the long-term effects of aging. Throughout our lifetime, we accumulate damage generated by UV radiation. UV causes inflammation, immune changes, physical changes, impaired wound healing and DNA damage that promotes cellular senescence and carcinogenesis. Melanoma is the deadliest form of skin cancer and among the malignancies of highest increasing incidence over the last several decades. Melanoma incidence is directly related to age, with highest rates in individuals over the age of 55 years, making it a clear age-related disease. In this review, we will focus on UV-induced carcinogenesis and photo aging along with natural protective mechanisms that reduce amount of “realized” solar radiation dose and UV-induced injury.
    [Show full text]
  • Technical Appendix to the Sunscreen Proposed Rule
    DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration Technical Appendix to the Sunscreen Proposed Rule 1 Table of Contents I. Overview ................................................................................................................................. 3 A. Definitions ........................................................................................................................ 3 II. Sunscreen Product Counts ...................................................................................................... 4 A. Sunscreen Product Search ................................................................................................ 4 B. Private Label Products ..................................................................................................... 6 C. Sunscreen Firms and Manufacturers ................................................................................ 7 D. Number of Relabeled and Reformulated Units ................................................................ 9 1. Relabeled Units............................................................................................................. 9 2. Reformulated Units....................................................................................................... 9 III. Sales by Product ................................................................................................................. 10 A. Total Market Sales ........................................................................................................
    [Show full text]
  • What Is Acne? Acne Is a Disease of the Skin's Sebaceous Glands
    What is Acne? Acne is a disease of the skin’s sebaceous glands. Sebaceous glands produce oils that carry dead skin cells to the surface of the skin through follicles. When a follicle becomes clogged, the gland becomes inflamed and infected, producing a pimple. Who Gets Acne? Acne is the most common skin disease. It is most prevalent in teenagers and young adults. However, some people in their forties and fifties still get acne. What Causes Acne? There are many factors that play a role in the development of acne. Some of these include hormones, heredity, oil based cosmetics, topical steroids, and oral medications (corticosteroids, lithium, iodides, some antiepileptics). Some endocrine disorders may also predispose patients to developing acne. Skin Care Tips: Clean skin gently using a mild cleanser at least twice a day and after exercising. Scrubbing the skin can aggravate acne, making it worse. Try not to touch your skin. Squeezing or picking pimples can cause scars. Males should shave gently and infrequently if possible. Soften your beard with soap and water before putting on shaving cream. Avoid the sun. Some acne treatments will cause skin to sunburn more easily. Choose oil free makeup that is “noncomedogenic” which means that it will not clog pores. Shampoo your hair daily especially if oily. Keep hair off your face. What Makes Acne Worse? The hormone changes in females that occur 2 to 7 days prior to period starting each month. Bike helmets, backpacks, or tight collars putting pressure on acne prone skin Pollution and high humidity Squeezing or picking at pimples Scrubs containing apricot seeds.
    [Show full text]
  • What Is Acne and Why Do I Have Pimples?
    What is acne and why do I have pimples? The medical term for “pimples” is acne. Most people develop at least some acne, especially during their teenage years. Although many believe that acne comes from being dirty, this is not true; rather, acne is the result of changes that occur during puberty. Your skin is made of layers. To keep the skin from getting dry, the skin makes oil in little wells called “sebaceous glands” that are found in the deeper layers of the skin. “Whiteheads” or “blackheads” are clogged sebaceous glands. “Blackheads” are not caused by dirt blocking the pores, but rather by oxidation (a chemical reaction that occurs when the oil reacts with oxygen in the air). People with acne have glands that make more oil and are more easily plugged, causing the glands to swell. Hormones, bacteria (called P. acnes) and your family’s likelihood to have acne (genetic susceptibility) also play a role. SKIN HYGIENE Good skin care habits are important and support the medications your doctor prescribes for your acne. » Wash your face twice a day, once in the morning and once in the evening (which includes any showers you take). » Avoid over-washing/over-scrubbing your face as this will not improve the acne and may lead to dryness and irritation, which can interfere with your medications. » In general, milder soaps and cleansers are better for acne-prone skin. The soaps labeled “for sensitive skin” are milder than those labeled “deodorant soap” or “antibacterial soap.” » Many “acne washes” may contain salicylic acid. Salicylic acid (SA) fights oil and bacteria mildly but can be drying and can add to irritation.
    [Show full text]
  • Sunscreen Faqs
    Sunscreen FAQs What type of sunscreen should I use? There are two main types of sunscreen ingredients: physical sun blockers and chemical sunscreens. Physical sunscreens prevent ultraviolet light from reaching your skin, and contain either zinc oxide or titanium dioxide. Physical sunscreens protect against UVA and UVB damage. Physical sunscreens are preferred for patients with sensitive skin or children. Chemical sunscreens rely on an interaction between the sun and the chemical to protect your skin. Examples of such chemicals are avobenzone, octinoxate, homosalate, padimate O, and many others. Chemical sunscreens can protect against UVA, UVB, or both types of damage, depending on which ingredient is used. Read the label to ensure coverage for both UVA and UVB exposure. There are new ingredients being developed that take chemical sunscreens and stabilize them to prolong their activity (i.e., Helioplex, Mexoryl). Does the SPF really matter? In laboratory testing, there are minor differences between SPF 15 and SPF 30 or greater products. However, that data is based on using 1 oz. (30 gm.) of sunscreen for each full body application (the size of a shot glass). Most people use far less in real-life settings. For that reason, we recommend an SPF of at least 30. It is common to find good sunscreens with SPF ranging from 45-70. To maintain protection, reapply sunscreen every 1-3 hours, depending on sweating, water exposure, and sun intensity. Is sunscreen alone enough to protect my skin in the sun? In some cases, yes. However, if you are in the sun for longer periods on a regular basis (such as gardening, golfing, boating, sports), it may be better to add sun protective clothing or habits.
    [Show full text]
  • FDA Proposes Sunscreen Regulation Changes February 2019
    FDA Proposes Sunscreen Regulation Changes February 2019 The U.S. Food and Drug Administration (FDA) regulates sunscreens to ensure they meet safety and eectiveness standards. To improve the quality, safety, and eectiveness of sunscreens, FDA issued a proposed rule that describes updated proposed requirements for sunscreens. Given the recognized public health benets of sunscreen use, Americans should continue to use broad spectrum sunscreen with SPF 15 or higher with other sun protective measures as this important rulemaking eort moves forward. Highlights of FDA’s Proposals Sunscreen active ingredient safety and eectiveness Two ingredients (zinc oxide and titanium dioxide) are proposed to be safe and eective for sunscreen use and two (aminobenzoic acid (PABA) and trolamine salicylate) are 1 proposed as not safe and eective for sunscreen use. FDA proposes that it needs more safety information for the remaining 12 sunscreen ingredients (cinoxate, dioxybenzone, ensulizole, homosalate, meradimate, octinoxate, octisalate, octocrylene, padimate O, sulisobenzone, oxybenzone, avobenzone). New proposed sun protection factor Sunscreen dosage forms (SPF) and broad spectrum Sunscreen sprays, oils, lotions, creams, gels, butters, pastes, ointments, and sticks are requirements 2 proposed as safe and eective. FDA 3 • Raise the maximum proposed labeled SPF proposes that it needs more data for from SPF 50+ to SPF 60+ sunscreen powders. • Require any sunscreen SPF 15 or higher to be broad spectrum • Require for all broad spectrum products SPF 15 and above, as SPF increases, broad spectrum protection increases New proposed label requirements • Include alphabetical listing of active ingredients on the front panel • Require sunscreens with SPF below 15 to include “See Skin Cancer/Skin Aging alert” on the front panel 4 • Require font and placement changes to ensure SPF, broad spectrum, and water resistance statements stand out Sunscreen-insect repellent combination 5 products proposed not safe and eective www.fda.gov.
    [Show full text]