Seasonal Dashboard

Daylight shortens quickly in autumn, and blood vitamin D levels typically decline toward winter. Supplementation reliably raises blood levels; benefits beyond correcting deficiency are modest in trials.

The autumn return to work and school routines often coincides with higher perceived stress. Several randomized trials report lower stress scores with ashwagandha, though most are small and short.

Colds become more frequent as autumn progresses. Meta-analyses suggest zinc started early in a cold may shorten it; evidence for preventing colds is limited.

Colds and flu become more common as autumn progresses. Evidence for elderberry is weak: only a few small trials suggest shorter symptom duration.

Shorter days and the autumn clock change can shift sleep timing. Meta-analyses show melatonin modestly shortens time to fall asleep and can help shift the body clock.