Skin Care and Treatments of Melbourne Dermatology - Safety of Micronized Zinc Sunscreens

86,200+ expert documents for the skincare aficionado.

Home

Account Login/View Cart/Checkout

Perennial / Wisdoms

UV Exposure
Aging Skin and Mature Skin
Theories of Aging
Antioxidants
Sunscreens

Selected Skin Care

Avene
Dibi
Glytone
Heliocare
Kinerase
Kinerase PhotoFacials
Kinerase Pro+
La Roche Posay
MD Rx
Neostrata
OlosPrevage MD
RevaleSkin
Ti-Silc / Z-Silc
Tricomin
VitaMedica
Browse more brands.

Facial Skin Condition Treatments

Adult Acne
Dark Circles
Deep Wrinkles
Hyperpigmentation
Open Pores
Puffy Eyes
Rosacea

Body Skin Condition Treatments

Keratosis Pilaris

Skin Care Ingredients

Alpha Lipoic Acid
Arginine + Serine
Asiatic Acid
Blueberry
Caffeine
Capryloyl Salicylic Acid
Ceramides
Chlorogenic Acid
Chrysin
Coffee Berry
Hydrolyzed Hyaluronic Acid
Mexoryl
Pro-Xylane
Silymarin
Sodium Laureth Sulfate/Sulphate
Browse more ingredients.

Clinical Procedures and Topics

Aging Skin
French Skin Care
Idebenone
Klein Becker
Oxidative Stress
Perricone
Skin Structure
Stem Cells
Healthy Skin Barrier Function
Smoking
Sun Protection
Topical Vitamin C/Firming
Choices and Needs
Strivectin

Browse more clinical skincare topics.


Safety of Micronized Zinc Sunscreens

Safety of Micronized Zinc Sunscreens

Lately there has been increased concern that the particles of sunscreens containing micronized zinc oxide ("invisible zinc") penetrate skin, cause free radical damage to cells and lead to alteration of skin's DNA.

Sunscreens containing micronized zinc have been generally preferred over others because they block the greatest gamut of ultraviolet, are less likely to irritate skin, less prone to wearing away during the day, and are markedly less whitening than traditional zinc sunscreens.

The concern that microfine zinc sunscreens could do more harm than good was raised more than a decade ago.

Subsequent studies have shown that micronized zinc can pass through the skin in areas affected by acne, sunburn, eczema or shaving.

Studies have shown that micronized zinc exposed to ultraviolet produces free radical damage.

In light of the growing evidence that micronized zinc may be harmful, and because nanoparticles in sunscreens are not regulated, caution should be exercised when using ultrafine zinc sunscreens.

Studies have shown that micronized zinc coated in dimethicone, a form of silicone used as a primary ingredient in many moisturizers, forms a barrier to help prevent zinc from penetrating skin or reacting with light in ways which can be harmful.

Dimethicone-coated microfine zinc is a proprietary substance more expensive than uncoated zinc and is therefore not available in all sunscreens.

It is also usually unsuitable for application to large areas due to cost.

For daily face, neck, ear and hand protection against photodamage (skin cancer, wrinkles, dark blotches/hyperpigmentation, freckles, leathery skin texture, yellowed colouring and a loss of elasticity), micronized dimethicone zinc sunscreens nevertheless remain the most efficacious.

Recommended Ultrafine Zinc Sunscreens

Contain dimethicone-coated and micronized rather than nanoparticle zinc at a concentration of 8% or higher and are suitable for daily use on the face, neck, hands and ears:

Note: SPF regulation and numbers differ by region. US SPF figures are quoted.

Supplementary Sun Protection

Dietary, supplementary and topically applied antioxidants such as lutein, green tea, zeatin, Heliocare and chlorogenic acid can enhance the protection offered by sunscreens, however should not be used in place of sunscreens.

Related Skin Care Information, Products and Expert Discussions

Dr. Albert Laporte

Skinceuticals Broken Capillary Protocols

Bungling Avobenzone

Skinceuticals Daily Sun Defense SPF 20 vs. Ultimate UV Defense SPF 30

Different Sunscreens provide Different Skin Protection


Sunscreens :

Selected Sunscreens : Anti-Aging Sunscreen Reminders : Mineral Makeups as Sunscreens : Sunscreen for Oily Skin : Relying on Sunscreens in Makeup : Zinc Oxide Sunscreens are Usually Superior : The Evolution of Sunscreens : Safety of Micronized Zinc Sunscreens : In-Vitro Sunscreen Performance Evaluations : Safety Concerns Over High-Tech (Nanotechnology) Sunscreens : Different Sunscreens provide Different Skin Protection : L'Oreal and Nivea Sunscreens Fail to Provide Stated SPFs : Flaws in The Current Evaluation of SPF (Sun Protection Factor) : Comparison of 33 Sunscreens : Bungling Avobenzone : UVA: The Trojan Horse of Premature Ageing of the Skin : Effects of UVA Exposure : True Broad Spectrum Sunscreen in Action: Protection of Skin Cell Nuclei and Keratinocytes : Your Skin and The Sun : Optimal Sunscreen Use : The Truth About Sunscreens : Recommended Sunscreens : Select Sunscreen by Common Skin Type : Select Sunscreen by Skin Condition or Treatment : Select Sunscreen by Brand : Sunscreen Brushes : Water-Resistant Sunscreens : Skin Care References for Sunscreens :


New/Notable 2016

Open Pores — Treatment and Prevention

MD Rx Melbourne Dermatology Open Pores Overnight Solution

The Sun

Radiation

Mexoryl

Pentapeptides Ineffective

Asiaticoside vs. Madecassoside for Collagen Synthesis

La Roche-Posay Redermic

Valeant Pharmaceuticals

Rainbow

Telomerase

Azelaic Acid

Bisabolol

Avena Sativa

Panthenol

Aster Family of Plants

Green Tea (Camellia Sinensis) Extract

Polyphenols

Caffeine

Oxofulleram

Salicylic Acid

Capryloyl Salicylic Acid

Open Pores

Phytosphingosine

Glycerin

Idebenone

Ascorbyl Palmitate

Kojic Acid

Algorithm for Optimal Sustained Exfoliation: Glycolic Acid

Comparison of 33 Sunscreens