Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Astaxanthin | Melatonin | |
|---|---|---|
| Category | Supplements | Supplements |
| Standard Dose | 4-12mg daily | 0.3-1mg for sleep onset (physiological); 3-5mg for jet lag; 10-20mg for oncological adjunct (under supervision) |
| Timing | With a fat-containing meal for absorption (fat-soluble carotenoid). | 30-60 minutes before desired sleep onset. For circadian phase advance: 4-6 hours before desired bedtime. Sublingual for faster onset. Dim lights 1-2 hours before taking. |
| Cycle Duration | ongoing | Short-term for jet lag (3-5 days); ongoing at low dose for circadian support if needed; extended for oncological use under supervision |
| Evidence Level | moderate_human | strong_human |
Astaxanthin spans the entire cell membrane bilayer due to its unique molecular structure (polar end groups with a polyene chain), providing antioxidant protection on both the inner and outer membrane surfaces simultaneously — unlike other carotenoids. It quenches singlet oxygen 6000x more effectively than vitamin C, 800x more than CoQ10, and 550x more than vitamin E. It suppresses NF-kB and modulates Nrf2, reduces oxidative damage to mitochondrial membranes, and protects LDL from oxidation. Uniquely, it crosses the blood-retinal barrier and blood-brain barrier.
4-12mg daily
With a fat-containing meal for absorption (fat-soluble carotenoid).
ongoing
Melatonin (N-acetyl-5-methoxytryptamine) is synthesized from serotonin in the pineal gland, regulated by the suprachiasmatic nucleus (SCN) via the retinohypothalamic tract. It binds MT1 and MT2 G-protein coupled receptors: MT1 activation suppresses neuronal firing in the SCN (sleep onset), while MT2 modulates circadian phase shifting. Beyond sleep, melatonin is a potent antioxidant that scavenges hydroxyl radicals, peroxynitrite, and singlet oxygen, and upregulates antioxidant enzymes (GPx, SOD, catalase) via Nrf2. It has anti-inflammatory properties (NF-kB suppression), immunomodulatory effects, oncostatic activity (anti-proliferative in several cancer types), and mitochondrial protective functions.
0.3-1mg for sleep onset (physiological); 3-5mg for jet lag; 10-20mg for oncological adjunct (under supervision)
30-60 minutes before desired sleep onset. For circadian phase advance: 4-6 hours before desired bedtime. Sublingual for faster onset. Dim lights 1-2 hours before taking.
Short-term for jet lag (3-5 days); ongoing at low dose for circadian support if needed; extended for oncological use under supervision
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