Sunscreen and Its Harmful Effects

Introduction to Sunscreen

Sunscreen, also known as sunblock or suntan lotion, is a topical product designed to protect the skin from the harmful effects of Ultraviolet (UV) radiation. It works by absorbing, reflecting, or scattering the sun's rays to prevent DNA damage that can lead to skin cancer and premature aging.

Types of Sunscreens

• Physical (Mineral) Sunscreens: Contain active mineral ingredients like Zinc Oxide or Titanium Dioxide. They sit on top of the skin and reflect UV rays like a mirror.
• Chemical Sunscreens: Contain organic compounds such as Oxybenzone, Avobenzone, and Octinoxate. These absorb UV radiation and convert it into heat, which is then released from the skin.

Harmful Environmental Effects

While sunscreens protect humans, their chemical runoff has significant negative impacts on marine ecosystems:

• Coral Bleaching: Chemicals like Oxybenzone and Octinoxate are known to cause coral bleaching even at very low concentrations. They stress the coral, causing it to expel the algae it needs for survival.
• Bioaccumulation in Marine Life: These chemicals can accumulate in the tissues of fish, dolphins, and sea turtles, potentially causing reproductive issues and developmental defects.
• Water Quality Degradation: Sunscreen ingredients contribute to chemical pollution in popular tourist coastal areas, affecting the natural balance of the "blue" environment.

Potential Human Health Concerns

Recent scientific studies have raised concerns regarding the systemic absorption of certain chemical ingredients:

• Hormonal Disruption: Some chemical filters, particularly Oxybenzone, are suspected to be endocrine disruptors, meaning they can mimic or interfere with the body's natural hormones.
• Skin Irritation and Allergies: Preservatives and fragrances in sunscreens can cause contact dermatitis or allergic reactions in individuals with sensitive skin.
• Vitamin D Deficiency: Excessive and total use of high-SPF sunscreens can inhibit the skin's natural ability to synthesize Vitamin D from sunlight, which is essential for bone health.

Conclusion and Recommendations

To balance skin protection with environmental safety, experts recommend:

• Using "Reef Safe" sunscreens that lack Oxybenzone and Octinoxate.
• Opting for Physical Sunscreens (non-nano Zinc or Titanium).
• Utilizing mechanical protection like UV-rated clothing, hats, and seeking shade during peak hours (10 AM - 4 PM).

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VIMALA COLLEGE (AUTONOMOUS), THRISSUR
SECOND SEMESTER UG DEGREE EXAMINATION, APRIL 2025
VMFYUGP : MDC - Chemistry
CHE2FM106 : CHEMISTRY IN DAILY LIFE