The LockIn Blog
#caffeine
Evidence-first writing on focus, attention and high-stakes work from the LockIn team. No hype, every claim sourced.
· 3 min read
Caffeine for JEE, UPSC and CAT Prep: How to Time It Without Wrecking Your Sleep
How exam aspirants should use caffeine: timing, dose, cut-off hours, exam-day rules and what to do if you're under 18. Practical and evidence-based.
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Caffeine Half-Life: How Long It Stays in Your Body and When to Stop
Caffeine half-life is about 5 hours but ranges from 1.5 to 9.5. See how long caffeine stays in your system and how to set your own cut-off time.
Read article →· 3 min read
Caffeine + L-Theanine: Ratio, Dose and How Long It Lasts
Caffeine and L-theanine: the 1:2 ratio explained, doses used in trials, how long it lasts, and when to take it. Evidence-first, with named studies.
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How Much Caffeine Is Too Much? Limits by Bodyweight (400 mg, 200 mg, 3 mg/kg)
How much caffeine is too much? The 400 mg adult limit, 200 mg per dose, the 3 mg/kg rule for teens, and how chai, coffee and cola add up.
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