Sleep
Most "sleep advice" is generic. We calculate your sleep debt, test the products that actually move the needle, and translate the science into a plan you can run tonight.
Direct clinical evidence that cinnamon helps people fall asleep faster is essentially absent — no well-designed human trials have tested this outcome specifically. Some indirect mechanisms (blood-sugar stabilization, mi…
Weak evidence: Alpha-lipoic acid (ALA) has no meaningful clinical evidence supporting its use specifically for falling asleep faster — this is not an established use. ALA is a well-studied antioxidant for conditions lik…
Thin direct evidence: No robust clinical trials have specifically tested berberine for falling asleep faster (sleep-onset latency) in humans. Indirect signals exist: Berberine has shown sedative-like and anxiety-reducin…
Thin evidence: Research directly linking probiotic supplementation to falling asleep faster is limited; most sleep benefits seen in trials are secondary findings, not the primary outcome studied. Gut-brain connection is…
Very limited direct evidence: No well-powered human clinical trials have specifically tested inulin as a tool for falling asleep faster (reducing sleep-onset latency). Indirect pathway exists: Inulin feeds gut bacteria …
No direct evidence: No clinical trials have tested psyllium husk specifically for falling asleep faster or reducing sleep onset latency. Indirect pathways exist but are speculative: Psyllium's effects on blood sugar sta…
Iron deficiency is genuinely linked to sleep problems , including restless legs syndrome (RLS) and disrupted sleep — but only if you're actually deficient. Correcting a documented deficiency may improve sleep quality an…
Limited direct evidence: No large, well-designed clinical trials confirm that zinc supplementation meaningfully shortens the time it takes healthy adults to fall asleep. Mechanistic plausibility exists: Zinc plays a rol…
Very little direct evidence: No well-designed human clinical trials have specifically tested vitamin K2 for reducing sleep-onset time (how long it takes to fall asleep). Indirect links exist but are speculative: K2's ro…
Vitamin D3 deficiency is associated with poorer sleep quality and longer sleep-onset latency in some observational studies, but causation has not been firmly established. A small number of intervention trials suggest co…
Fish oil (omega-3 fatty acids, particularly DHA) has a plausible biological link to sleep, but direct evidence that it helps you fall asleep faster is limited and largely from studies in children. The strongest pediatri…
Caffeine does not help you fall asleep faster — the evidence consistently shows the opposite: it delays sleep onset and reduces total sleep time. Caffeine blocks adenosine receptors, the brain's primary sleep-pressure s…
No meaningful evidence supports beta-alanine as a sleep aid or a way to fall asleep faster — this pairing is not backed by clinical research. Beta-alanine is well-studied for exercise performance (buffering muscle acid …
Indirect plausibility, limited direct evidence: Whey protein contains tryptophan, a precursor to serotonin and melatonin, but studies directly testing whey protein for sleep-onset speed in healthy adults are sparse. Alp…
Evidence is thin: No robust clinical trials have directly tested creatine monohydrate as a sleep-onset aid in healthy adults. Indirect signals exist: Small studies suggest creatine may partially offset cognitive impairm…
Modest, real signal: L-theanine appears to reduce the time it takes to fall asleep in some studies, but effect sizes are small and most trials are short, small, or industry-funded. Best evidence is for sleep quality, no…
A handful of small, controlled trials suggest ashwagandha may modestly reduce the time it takes to fall asleep, but the overall evidence base is limited and effect sizes are modest. The most-studied preparation is a roo…
Magnesium appears to modestly reduce the time it takes to fall asleep, particularly in older adults and people with low magnesium levels — but the effect size is small and evidence in healthy, well-nourished adults is l…
Oral GABA supplements may modestly reduce the time it takes to fall asleep , but the overall evidence base is small and most trials are short-term with fewer than 100 participants. A core biological problem exists: GABA…
Limited but promising early evidence: Small studies suggest 5-HTP may improve sleep quality and reduce the time it takes to fall asleep, primarily by boosting serotonin and supporting melatonin production — but large, h…
Early-stage evidence only: NAD precursors (NMN and NR) show some biological plausibility for supporting sleep, but human clinical trials specifically targeting sleep quality are limited and small. Circadian connection i…
Weak direct evidence: No large, well-designed clinical trials have tested CoQ10 specifically for improving sleep quality in healthy adults. Indirect signals exist: CoQ10's role in mitochondrial energy production and its…
Evidence for ginseng improving sleep quality is preliminary and mixed — most human trials are small, short, and use varying preparations. Some research suggests ginseng ginsenosides may modestly reduce sleep latency and…
Evidence is thin and indirect: Rhodiola rosea has not been rigorously studied as a direct sleep aid; most sleep-related findings come as secondary observations in stress and fatigue trials. It may help sleep indirectly …
Mixed, limited evidence: Green tea extract has not been convincingly shown to improve sleep quality in healthy adults — the research base is thin and results are inconsistent. L-theanine, not the whole extract, is the m…
Very limited direct evidence: No robust human clinical trials have tested ginger specifically for improving sleep quality as a primary outcome. Plausible indirect mechanisms exist: Ginger's anti-inflammatory and seroton…
Limited direct evidence: No large, well-designed human clinical trials have specifically tested curcumin as a sleep aid — the evidence base is thin and mostly indirect. Plausible but unproven mechanism: Curcumin's anti-…
Direct human evidence that cinnamon improves sleep quality is very limited — no robust clinical trials have tested cinnamon specifically as a sleep aid. Some indirect pathways exist (blood-sugar stabilization, anti-infl…
Weak direct evidence: No clinical trials have tested alpha-lipoic acid (ALA) specifically to improve sleep quality in otherwise healthy adults. Indirect signals exist: ALA's antioxidant and anti-inflammatory effects may…
Direct human evidence for berberine improving sleep quality is sparse — most relevant research is animal-based or incidental to studies targeting other conditions. Berberine may influence sleep-related pathways (AMPK ac…