Magnesium is a popular sleep supplement, but the clearest human evidence is still concentrated in older adults with insomnia rather than everyone with a rough night of sleep.
Glycine has a small but interesting human sleep literature, with the clearest signal around bedtime use to improve perceived sleep quality and next-day functioning.
A new sleep-nutrition review places L-theanine in the serious sleep-support conversation — but the strongest read is relaxation and wind-down support, not a guaranteed insomnia fix.
People usually want to know whether ashwagandha meaningfully helps everyday stress, how fast it works, and whether the hype around cortisol is backed by actual trials.
