Every intervention Outliyr has scored for circadian rhythm, ranked by its BioHarmony score for this use case rather than its overall rating. The number beside each name is how well that one thing works for circadian rhythm; the tier beside it is what it is worth once safety, cost and effort are counted across everything else.
23 of 87 evaluated interventions score 3.0+ out of 10 for circadian rhythm · 2 comparisons
Melatonin is strongest for circadian-rhythm timing because the signal is directly tied to phase response, blind free-running rhythms, jet lag, and delayed sleep phase. The phase-response study found 0.5 mg and 3…
Red Light Therapy can add morning or daytime red and near-infrared exposure without the melatonin suppression profile of blue-rich evening light. The evidence is more physiological than endpoint-specific; Karu 2010 supports mitochondrial…
The existing rationale points to this narrower claim: Heat can reinforce temperature rhythm when timed well, especially late afternoon or early evening. It is not a substitute for morning outdoor. That does…
The evidence points to a plausible use case without proving a universal response. Peters B et al. 2025 is the best anchor here because it reports 31 participants randomized crossover trial in…
The evidence points to a plausible use case without proving a universal response. Korkushko et al. 2004 is the best anchor here because it reports source-verified epithalamin melatonin paper and relevant precursor…
Kawai 2015 anchors the most relevant signal. Glycine fits circadian rhythm because glycine participates in sleep signaling, glutathione, collagen, methylation, and nervous-system balance, depending on the endpoint. The score stays bounded because…
Pre-bed PEMF use may support subjective wind-down, but this is not a circadian zeitgeber like morning sunlight. The effect is better framed as relaxation timing and autonomic settling. No strong human RCT…
Autonomic tone tracks circadian phase and pre-sleep use may support sleep onset, but VNS is not a primary circadian zeitgeber like morning light. The score stays bounded because Vagus Nerve Stimulation evidence…
Vabishchevich 2026 makes the claim plausible but incomplete. The existing rationale points to this narrower claim: Morning outdoor Zone 2 can support circadian rhythm through light exposure, body-temperature rise, and consistent timing.…
Semaglutide has no clear human circadian benefit or disruption endpoint in this report. Wilding 2021 supports weight loss, not clock timing. Appetite changes can indirectly alter meal timing, glucose rhythms, and sleep…
AMPK intersects with circadian machinery, but metformin has no direct chronobiology RCT endpoint. Dosing should be chosen for meals and tolerance, not circadian manipulation.
No direct circadian rhythm evidence was verified. EAAs are nutrient signals, not light, temperature, meal-timing, or melatonin interventions, so this remains a low-relevance use case.
There is no direct circadian-rhythm evidence. Morning dosing is sensible because Tongkat Ali can feel activating and because evening dosing is more likely to impair sleep.
No direct circadian data. AKG connects to metabolism and nutrient sensing, but there is no human circadian endpoint or timing study.
Tirzepatide may indirectly improve circadian stability by reducing OSA severity, nocturia from hyperglycemia, and late night hunger for some users. No direct circadian phase, melatonin, temperature rhythm, or chronobiology trial exists. Score…
INSUFFICIENT_EVIDENCE for circadian-rhythm benefit, though dose timing may affect sleep and recovery monitoring.
No direct circadian evidence. Whole-body vibration can fit morning routines, but no verified circadian phase-shift trials justify a higher score.
Morning practice may entrain circadian rhythms via HPA modulation.
Morning exercise can support circadian timing. Evening 4x4 can delay sleep for sympathetic-sensitive users, so the timing effect is context-dependent.
Circadian-rhythm support is indirect through sleep-quality improvement; saffron has no direct DLMO, light-response, or circadian-phase trial.
Evening tesamorelin dosing aligns with nocturnal GH secretion, but tesamorelin is not a circadian-reset intervention. Any circadian benefit is secondary to sleep timing and endocrine pulse matching.
Testosterone has a natural circadian rhythm, and route timing can matter for symptoms. TRT does not entrain circadian rhythm like morning sunlight, sleep timing, or light-dark hygiene.
Circadian support is secondary. Better sleep and cortisol rhythm can help users feel more aligned, but ashwagandha does not directly provide a light, meal-timing, or temperature cue. Morning sunlight and consistent wake…
Nothing matches those filters.
Monthly out-of-pocket cost at the most accessible legitimate channel, at the dose the score was given for. 5 of 23 are not priced yet; those cells are left blank rather than guessed.
| Intervention | Monthly cost | At dose | How you get it |
|---|---|---|---|
| Melatonin | $3–$8 | 0.5 to 3 mg | Over the counter |
| Red Light Therapy | $17–$43 | 10-20 min at 6-12 inches, full chest/face/back rotation | Over the counter |
| Infrared Sauna | $36–$73 | 55-60 degrees C, 20-30 min | Over the counter |
| Time-Restricted Eating | Not priced yet | ||
| Epitalon | $95–$1,100 | 5-10 mg/day subcutaneous | Grey market |
| Glycine | $2–$3 | 3 g oral glycine | Over the counter |
| PEMF (Pulsed Electromagnetic Field Therapy) | $3–$117 | 20-30 min mat session | Over the counter |
| Vagus Nerve Stimulation | $4–$8 | 10-20 min auricular tVNS at comfortable perceptible intensity | Over the counter |
| Zone 2 Cardio | Not priced yet | Over the counter | |
| Semaglutide | $199–$349 | 0.25 mg weeks 1 to 4, 0.5 mg weeks 5 to 8, 1.0 mg weeks 9 to 12, 1.7 mg weeks 13 to 16, 2.4 mg week 17 onward | Prescription |
| Metformin | $4–$30 | 500 mg with dinner for 1 week, then 500 mg twice daily for 1 week, then increase by 500 mg/week toward 1000 mg twice daily as tolerated | Prescription |
| Essential Amino Acids | Not priced yet | ||
| Tongkat Ali | $20–$40 | 200 mg/day Physta standardized extract | Over the counter |
| Ca-AKG (Calcium Alpha-Ketoglutarate) | $15–$30 | 1 g/day generic Ca-AKG oral | Over the counter |
| Tirzepatide | $299–$449 | 2.5 to 5 to 7.5 to 10 to 12.5 to 15 mg | Prescription |
| Rapamycin | $15–$50 | 3 mg | Prescription |
| Whole-Body Vibration | $50–$100 | 30 Hz, roughly 0.3g, 10-20 min standing | Over the counter |
| HRV Biofeedback | $5 | 20 min/session at individual RF (4.5 to 6.5 bpm) | Over the counter |
| Norwegian 4×4 | Not priced yet | Over the counter | |
| Saffron | Not priced yet | ||
| Tesamorelin | $250–$500 | 2 mg subcutaneous daily in the evening | Prescription |
| TRT (Testosterone Replacement Therapy) | $50–$300 | Clinician-selected formulation at the lowest dose likely to restore physiologic testosterone | Prescription |
| Ashwagandha | $15–$30 | 300 mg KSM-66 with breakfast and 300 mg with dinner | Over the counter |
Head-to-head reports and category rankings that name a winner on this use case.
Melatonin, dosed low. It scores 7.5–8.0/10 against apigenin's 5.5–6.0/10 and wins the sleep rows outright. The morning hangover apigenin markets against comes from taking too much, not from…
Red light therapy scores 7.5–8.0/10 and PEMF 7.5–8.0/10, so the panel is the better first buy for most people. PEMF wins on bone and joint pain, where a…
Melatonin, at 7.5–8.0 out of 10 for circadian rhythm. Melatonin is strongest for circadian-rhythm timing because the signal is directly tied to phase response, blind free-running rhythms, jet lag, and delayed sleep phase.
Of the top-scoring options, Glycine is the least expensive at about $2 a month, scoring 6.0–6.5 out of 10 for circadian rhythm.
23 of the 87 interventions evaluated for circadian rhythm score 3.0 out of 10 or better, which is the cut-off for appearing on this page.
