Winter Blues? 3 Ways to Fight Seasonal Depressed Moods & Feel Great
Are you one of the millions of adults who feels more “down” than usual during the winter months? For some, it’s a minor mood shift. For others, it can be a full-blown season of sadness, overwhelm, anxious feelings, and depressed…
The Truth About Vitamin D: 10 Facts on Levels, Benefits and Safety
Written by Don Colbert, MD, board-certified in family practice and in anti-aging and integrative medicine for more than 25 yearsLast reviewed and updated: October 30, 2026 Vitamin D is one of the most talked-about supplements of the last decade, and…
Thinning Hair? Nutrient Deficiencies Can Cause Hair Loss (Part 1)
If you’re experiencing hair loss, you may have a nutrient deficiency or condition causing it. Hair loss can result from many issues, including malnutrition, medical conditions, stress, damage to hair follicles, and more. While it’s traditionally thought of as an…
Vitamin D and Immune Function: Your Winter Guide
Even when it’s a sunny winter day, you may not get enough of the “sunshine vitamin.” In fact, it’s estimated that 25-50% of adults in the United States are deficient in Vitamin D (1). And, it seems to be more…
