Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| L-Theanine | Taurine | |
|---|---|---|
| Category | Amino Acids | Amino Acids |
| Standard Dose | 100-200mg daily (or as needed for acute anxiety/focus) | 1000-3000mg daily |
| Timing | Flexible: morning for calm focus (stack with caffeine), before stressful events, or evening for relaxation/sleep onset. Onset: 30-60 minutes oral, 15-20 min sublingual. | Flexible. Evening preferred for sleep/relaxation benefits. Pre-workout for cardiac and exercise performance benefits. |
| Cycle Duration | ongoing or as needed | ongoing |
| Evidence Level | strong_human | strong_human |
L-Theanine (gamma-glutamylethylamide) crosses the blood-brain barrier via the large neutral amino acid transporter. It increases alpha brain wave activity (8-13 Hz, associated with relaxed alertness), enhances GABA, serotonin, and dopamine levels in the brain, and antagonizes glutamate excitotoxicity by blocking glutamate binding at AMPA, kainate, and NMDA receptors. It also increases BDNF and NGF expression, supporting neuroplasticity. The combination of glutamate antagonism and GABA/serotonin enhancement produces anxiolysis without sedation — a 'calm focus' state.
100-200mg daily (or as needed for acute anxiety/focus)
Flexible: morning for calm focus (stack with caffeine), before stressful events, or evening for relaxation/sleep onset. Onset: 30-60 minutes oral, 15-20 min sublingual.
ongoing or as needed
Taurine is a sulfonic acid amino acid (not incorporated into proteins) with diverse physiological roles. It is the most abundant free amino acid in excitable tissues (heart, brain, retina, muscle). Mechanisms: GABA-A receptor agonism (inhibitory neurotransmission), glycine receptor agonism, osmoregulation (cell volume regulation via taurine transporter TauT), bile acid conjugation (taurocholate formation for fat digestion), calcium handling in cardiomyocytes (modulates RyR2/SERCA2a), mitochondrial protein synthesis (taurine modification of mitochondrial tRNA), and potent antioxidant (directly scavenges HOCl, stabilizes membranes). Recently identified as a longevity-associated molecule — taurine levels decline with age and supplementation extends lifespan in mice.
1000-3000mg daily
Flexible. Evening preferred for sleep/relaxation benefits. Pre-workout for cardiac and exercise performance benefits.
ongoing
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