Struggling with winter blues? Discover the best serotonin-boosting gifts for holiday stress relief in our 2025 guide. From 5-HTP supplements (43% anxiety reduction) to light therapy lamps (60-80% SAD efficacy), compare science-backed picks like SAM-e, magnesium + L-theanine, and vitamin D3 + K2. Timing tips, FAQs, and affiliate links for seasonal affective disorder support—restore your mood this holiday season!