In The Sunlight Cure, science writer Julian Foss Reyner cuts through decades of confusion to reveal the evidence-based truth about sun exposure. This is not a book about baking in the sun or abandoning sunscreen. Instead, it offers a nuanced, practical guide to harnessing sunlight's benefits while respecting its risks. Based on the consensus of health authorities worldwide, Reyner explains when to seek the sun, how much is optimal for your skin type and location, and why our indoor-centric modern lives are starving us of a vital nutrient beyond vitamin D. You'll discover the profound role morning light plays in resetting your circadian rhythm, improving sleep, and boosting mood. Learn simple strategies to integrate safe sun exposure into your daily routine using UV index and shadow rules. Understand the key concept of sun exposure dosage — enough to produce vitamin D and other benefits without increasing skin cancer risk. Whether you live in a sunny climate or a cloudy one, this book empowers you to reclaim a healthy relationship with daylight. Part of The Sagewell Wellness Library.