Short answer: Because it contains natural caffeine, avoid taking it late in the day if you're sensitive — a direct, specific timing caution.
Why this caution is tied to two specific named ingredients
Green Tea and Guarana are both natural caffeine sources — this late-day avoidance guidance connects directly to these two ingredients' combined caffeine content.
What a specific, practical next step looks like
If you are sensitive to caffeine, take it earlier in the day and start with the lowest suggested amount — a direct, actionable instruction worth following.
💡 Worth knowing: caffeine can cause jitteriness or sleeplessness in sensitive people — worth taking this caution seriously if you know you're sensitive.