Caffeine + L-Theanine side effects
Across 121 first-hand reports, people mentioned a side effect 5 times (about 4 per 100 reports). The most common: drowsiness, frequent urination, insomnia. User reports show what people notice — they can't tell you whether Caffeine + L-Theanine is safe for you.
Reported side effects
drowsiness1
frequent urination1
insomnia1
nausea1
dizziness1
What got worse for some people
In their own words
“3rd attempt: 100mg L-theanine and 200mg caffeine. Intensified feeling of nausea, slightly dizzy. This is exactly the opposite of what I wanted.”