Understanding The Benefits Of UV Light On Health

UV light, a form of non-ionising electromagnetic radiation, plays a crucial role in human health. Emitted by the sun and artificial sources such as UV lamps and LEDs, it exists beyond visible light on the electromagnetic spectrum. While excessive exposure can cause harm, controlled use of UV light contributes to physical and mental well-being.

This article explores the science behind UV light, its types, and the key benefits it provides when used responsibly.

Types Of UV Light & Their Effects

Type	Wavelength Range	Properties and Effects
UVA	320–400 nm	Long-wave UV forming about 95% of UV radiation reaching Earth. Penetrates deep into the skin, affecting collagen and contributing to ageing.
UVB	290–320 nm	Medium-wave UV responsible for vitamin D synthesis and sunburn. Vital for bone and immune health.
UVC	<290 nm	Short-wave UV absorbed by the ozone layer. Artificially produced for germicidal use in sterilisation.

Table 1: Each UV type has distinct wavelengths and biological effects

UVA affects deeper layers of skin, UVB supports vitamin D production, and UVC is primarily used for sterilisation in controlled environments.

Sources Of UV Light

Sunlight

The main natural source, sunlight contains both UVA and UVB rays that influence mood, vitamin D levels, and skin function. Controlled exposure supports health, but prolonged exposure without protection can cause damage.

Artificial UV Sources

• UV Ray Light Bulbs: Used in tanning, plant growth, and phototherapy.
• UV LED Lights: Energy-efficient, eco-friendly, and effective for sterilising air and water.
• UV Lamps: Emit UVC light for germicidal use in hospitals and laboratories.

Short daily exposure to UVB-rich light supports wellness, but overexposure must be avoided.

Health Benefits Of UV Light

When used safely, UV light supports several essential health and wellness processes.

Vitamin D Production

UVB converts 7-dehydrocholesterol in the skin into vitamin D3, vital for bone, immune, and muscle health. NICE guidance suggests 10–30 minutes of midday sun several times weekly supports vitamin D levels, though this varies by skin tone and season [2]. Deficiency remains common in the UK, especially during winter.

Mood Enhancement & WellBeing

Sunlight exposure increases serotonin, which improves mood and focus. Bright light therapy, which mimics natural UV light, reduces symptoms of Seasonal Affective Disorder in up to 80% of patients [3]. UV exposure also helps regulate circadian rhythm, improving sleep quality.

Libido & Energy

Sunlight boosts testosterone and oestrogen, supporting energy and well-being. Controlled studies, however, show variable results regarding vitamin D supplementation and hormone levels [4].

Skin Therapy

UVB light is widely used in dermatology for psoriasis and vitiligo. Narrowband UVB phototherapy improves psoriasis in up to 70% of patients [5]. It reduces inflammation and restores pigment in vitiligo, aiding repigmentation.

Monderma’s prescription skincare complements phototherapy by addressing acne, rosacea, and pigmentation for balanced results.

Immune System Support

Moderate UV exposure increases antimicrobial peptides in skin cells [6]. These peptides strengthen the skin’s defence against bacteria while vitamin D regulates immune response.

Disinfection & Sterilisation

UVC destroys microbes by damaging their DNA. It is used in hospitals, laboratories, and air purification systems, reducing infection rates and controlling multidrug-resistant organisms [7].

Benefit	Mechanism	Effect
Vitamin D Production	UVB converts skin precursors into vitamin D3	Strengthens bones and immunity
Mood Enhancement	UVA and UVB increase serotonin and regulate sleep	Reduces SAD symptoms and stress
Libido & Energy	UV influences hormone activity	Improves vitality and mood
Skin Therapy	UVB suppresses inflammation and stimulates pigment	Treats psoriasis and vitiligo
Immune Support	UVB boosts antimicrobial peptides	Lowers infection risk
Disinfection	UVC destroys microbial DNA	Sterilises air, surfaces, and water

Table 2: Controlled UV exposure promotes diverse health benefits

Potential Risks Of UV Light

Excessive UV exposure damages the skin and eyes. UVA penetrates deeply, accelerating collagen breakdown and premature ageing. UVB causes sunburn and increases long-term skin cancer risk. UVC, though germicidal, can harm tissue if handled unsafely.

Using UV Light Safely

Limit Exposure

Avoid direct sunlight between 10 a.m. and 4 p.m. and apply SPF 30 or higher daily.

Use Protective Gear

Wear UV-protective sunglasses and cover exposed skin during extended outdoor activity.

Manage Timing

Short, consistent exposure in the morning or afternoon delivers benefits with lower risk.

Professional Supervision

For treatments such as phototherapy, always follow a dermatologist’s guidance to ensure safe dosage and technique.

Safety Tip	Purpose
Use SPF 30+	Prevents UV damage
Wear UV-protective eyewear	Shields eyes from radiation
Short exposure sessions	Balances benefits and safety
Consult a professional	Ensures correct dosage and care

Table 3: Safe UV habits reduce harm while maintaining benefits

Choosing The Right UV Light Source

Purpose	Recommended Source	Application
Vitamin D Support	Natural sunlight	Short, regular exposure
Disinfection	UVC lamps or LEDs	Hospitals, homes, and laboratories
Phototherapy	UVB lamps	Medical treatment for skin disorders

Table 4: Each UV source serves specific health and safety needs

Monderma’s Role In Skincare

Monderma complements the benefits of responsible UV exposure with prescription skincare designed for acne, ageing, and pigmentation.

Formulas are individually prepared by GPhC-registered professionals using active ingredients such as tretinoin, azelaic acid, niacinamide, and adapalene to improve texture, tone, and clarity.

Conclusion

UV light, encompassing UVA, UVB, and UVC, plays an important role in health when managed carefully. From vitamin D production and immune support to mood regulation and skin therapy, balanced exposure offers proven benefits. Safe, limited use and proper protection ensure these advantages are achieved without harm.

Explore Monderma’s personalised skincare consultation to complement your healthy light habits and support long-term skin health.

Content is for informational purposes only. Monderma treatments are prescribed following consultation. Results and timeframes can vary. Use as directed by your prescriber.

Bibliography

1. Bolland MJ, Grey A, Avenell A. Effects of vitamin D supplementation on musculoskeletal health. Lancet Diabetes Endocrinol. 2016.
2. NICE. Vitamin D: Supplement use in specific population groups. PH56. 2014.
3. Lam RW et al. Efficacy of bright light treatment for depression. JAMA Psychiatry. 2016.
4. Lerchbaum E et al. Vitamin D and testosterone in healthy men. J Clin Endocrinol Metab. 2017.
5. Menter A et al. Guidelines of care for psoriasis phototherapy. JAAD. 2010.
6. Gläser R et al. UVB radiation induces antimicrobial peptides. J Invest Dermatol. 2009.
7. Anderson DJ et al. Enhanced terminal room disinfection study. Infect Control Hosp Epidemiol. 2017.