Sunlight is a fundamental part of human health. It is not only a source of warmth and light, but a powerful biological signal that helps regulate and support multiple systems throughout the body.  During Sunshine Month, we invite you to take a thoughtful, informed approach to sunlight—one that emphasizes balance, personalization, and long-term well-being.

Rather than overwhelming you with information, we guide you through a simple, practical path forward.

Begin with three essential steps:

Step 1: Learn

Gain a deeper understanding of how sunlight supports your health—from vitamin D production to its effects on mood, sleep, and overall physiology.
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Step 2: Measure

Vitamin D deficiency can also indicate sunshine deficiency. Knowing your current vitamin D level allows you to make informed, individualized decisions, especially about optimizing sunshine exposure… and vitamin D!
Order a Home Vitamin D Test Kit

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Step 3: Share Your Story

Translate knowledge into action by following a safe, personalized approach to sun exposure.
Share with others about how you implement safe sun exposure into your daily routine – Share Below!

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2026 Featured Sunshine Month Blogs

Balancing Sun Safety with Vitamin D Production

Tips for safely utilizing sun exposure to produce vitamin D, how vitamin D made in your skin provides additional benefits beyond vitamin D supplements, plus several myths about sunshine and vitamin D

How Much Sun Is Right for You? It Starts With Your Skin Type

Maximize benefits and reduce harms of sun exposure by understanding your skin type and following evidence-based recommendations for an individualized approach to sun exposure and protection

Sunshine Month and Nurses Week Collide: Are Our Nurses Missing the Light?

Rethinking the Health Consequences of Indoor and Shift Work

Sunlight and Longevity: Many Are Missing the Bigger Picture

Avoiding the sun may prevent some skin cancer deaths, but at the cost of overall health and longevity

The Emerging Science of Full-Spectrum Sunlight and Human Health

The unique biological consequences of full spectrum sunshine, including UVB, UVA, Red, Near Infrared, Far Infrared, and Blue Light

Top Diseases Related to Sunshine Deficiency

A lack of sunshine exposure can lead to decreased health and an increased risk of many diseases, also known as “Sunshine Deficiency” diseases

Your Brain Needs Sunshine: The Powerful Connection Between Sun, Mood & Mental Health

From serotonin and endorphins to circadian rhythm regulation and emotional resilience, sunlight plays a far greater role in mental wellbeing than many people realize

Heart-Healthy Chemicals Your Body Makes in the Sun

How sunlight-triggered molecules such as nitric oxide and vitamin D can support blood pressure, circulation, and cardiovascular health

A Comprehensive Strategy for Safe, Intelligent Sunlight Exposure

Practical tips and skin-nourishing nutrients to help implement intelligent sunshine exposure into your regular routine

The Sun & Autoimmune Disease: Revisiting the Healing Power of Light

A New Look at an Ancient Therapy

To Fear or Not to Fear? The Complicated Relationship Between Skin Cancer, Sunscreen, and Vitamin D

A new randomized controlled trial confirms a dark side to regular sunscreen use, further complicating the relationship between sun exposure, sunscreen, skin cancer, and vitamin D

Tribute to the Late Marc Sorenson, EdD

Honoring the life and legacy of one of the most passionate and influential advocates for sensible sun exposure and vitamin D education

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New Studies Featured in 2026

Gu et al. (2026)
“From a public health perspective, the most important question is not how sunlight affects one specific disease, but how it influences overall survival. Guidance to avoid sun exposure should be accompanied by an equally clear explanation of the potential health risks associated with too little sunlight.” Based on their calculations, the authors estimate that low UV exposure resulted in approximately 75 additional deaths for every 1 skin cancer death prevented.

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Mei et al. (2026)
This study found that participants exposed to brighter daytime light experienced a 13% lower risk of developing gastrointestinal cancers and a 24% lower risk of dying from them compared to those with lower light exposure. The strongest associations were observed for pancreatic cancer, where higher daytime light exposure was linked to a 42% lower incidence risk and a 53% lower mortality risk. Spending at least 2.4 hours per day in brighter outdoor-type light (≥5000 lux) was associated with additional reductions in pancreatic cancer risk and mortality.

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Tran et al. (2025)
This was the first randomized controlled trial specifically designed to examine the effect of routine use of modern high-SPF sunscreen (SPF 50+) on vitamin D status in real-world conditions. Participants assigned to daily SPF 50+ sunscreen use experienced significantly lower vitamin D levels compared to the control group. By the end of the study, vitamin D deficiency was considerably more common among routine sunscreen users (46% vs 37%). The authors concluded that regular sunscreen users, particularly those already at risk for low vitamin D, may need to monitor vitamin D levels and consider supplementation.

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Tanaka and Matsubayashi (2025)
This study demonstrates a clear dose-response relationship: as sunlight exposure increases, suicide risk progressively decreases. It provides strong empirical evidence that diminished sunlight exposure significantly increases suicide risk, reinforcing the idea that environmental light is a key determinant of mental health. The results suggest public health interventions could consider environmental and seasonal factors in suicide prevention strategies.

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A paper published in 2025 by Riedmann et al., based on a meeting of international experts reviewing current sunlight research in contrast to existing public health policy, concluded that regular, non-burning sun exposure likely supports cardiovascular health through several mechanisms beyond vitamin D production alone.

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Neale et al. (2024)
“The balance of risks and benefits of sun exposure is not the same for everybody. For people at very high risk of skin cancer, the risks of exposure likely outweigh the benefits; sun protection is essential. Conversely, people with deeply pigmented skin are at low risk of skin cancer but at high risk of vitamin D deficiency; routine sun protection is not recommended. For those at intermediate risk of skin cancer, sun protection remains a priority, but individuals may obtain sufficient sun exposure to maintain adequate vitamin D status.”

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Brennan et al. (2024)
The authors found that, while overall vitamin D levels did improve with increased calculated doses of UVB, the effect varied by ethnicity and age. While UVB dose was strongly associated with vitamin D levels among all ethnicities, it was the most important predictor of vitamin D level only among Whites, while vitamin D supplementation was the most important predictor among Asians and Blacks.

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Lindqvist et al. (2016) Older but powerful…
“We found smokers in the highest sun exposure group were at a similar risk as non-smokers avoiding sun exposure, indicating avoidance of sun exposure to be a risk factor of the same magnitude as smoking.”

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What Happens in Your Body When You Experience Sunlight

Sunlight initiates a cascade of biological responses that extend far beyond vitamin D.  When your body is exposed to natural sunlight:

• Vitamin D can be synthesized, supporting immune function and overall health
• Nitric oxide is released, contributing to cardiovascular support
• Serotonin levels rise, positively influencing mood and mental well-being
• Melatonin rhythms are regulated, supporting restorative sleep
• Endorphins are released, enhancing a sense of well-being

These interconnected processes highlight that sunlight is not a single-function input, it is a whole-body regulator.

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Beyond Vitamin D: A Whole-Body Perspective

While vitamin D is one of the most well-known outcomes of sun exposure, it represents only part of a broader physiological picture.  Sunlight also contributes to:

• Circadian rhythm regulation, helping align your internal clock with the natural day-night cycle
• Brain and mental health, supporting emotional balance, clarity, and resilience
• Immune system function, reinforcing the body’s natural defenses
• Emerging microbiome interactions, with early research suggesting connections between light exposure and gut health

Understanding sunlight in this broader context allows for a more complete and accurate view of its role in human health.

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Personalized Sun Exposure: The Most Important Step

There is no single recommendation that applies to everyone. Effective and safe sun exposure depends on individual factors.  Key considerations include:

• Skin type and natural pigmentation
• Time of day and seasonal sun angle
• Geographic location and UV index
• Age and overall health status
• DO NOT BURN!

A personalized approach helps maximize benefits while minimizing risk.

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Learn more in this short video:

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A Balanced Perspective: The Risks of Sun Avoidance

Public health messaging has often emphasized sun avoidance. While protection from overexposure and burning is essential, complete avoidance may have unintended consequences.  Limited sunlight exposure may:

• Contribute to low vitamin D levels
• Affect mood and mental well-being
• Disrupt natural sleep-wake cycles
• Influence overall physiological balance

The goal is not excessive exposure, but informed, moderate, and consistent sunlight.  Always avoid burning. 

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A Simple Daily Sunshine Routine

Incorporating sunlight into your daily life does not require complexity. Small, consistent habits can make a meaningful difference.

Morning
Begin the day with natural light exposure to support circadian alignment

Midday (when appropriate)
Brief, sensible sun exposure to support vitamin D production

Afternoon
Outdoor activity to reinforce physical and mental well-being

Over time, these small actions contribute to a more stable and supportive health foundation.

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