L-Theanine

Nootropic

Green tea amino that produces calm focus by raising alpha brain waves. Pairs perfectly with caffeine to take the edge off without sedation.

focuscalmanxietyalpha-waves

Typical dose

100–400 mg

Evidence

Moderate (some RCTs)

Onset time

Acute: 30–60 min

Half-life

~3 hours

Forms

Capsule, Powder

Source

plant

Best taken with

caffeine (1:2 ratio)

Best time of day

any

Bioavailability

5/5

Safety rating

5/5

Price per serving

$0.12

Vegan / GF / 3rd-party

✓ / ✓ / ✓

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Vetted brands, third-party testing, ships worldwide.

Common uses

• Calm focus
• Anxiety reduction
• Better sleep onset

Effect profile

Strength

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Muscle

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Energy

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Focus

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Mood

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Sleep

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Immunity

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Recovery

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Longevity

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Common side effects

• Generally none

Avoid if

• Low blood pressure

Drug interactions

• Blood pressure meds

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Medical disclaimer

SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements.