Caffeine

Safe for most adults but can cause jitters, sleep issues, and dependency. Not recommended for children or pregnant women.

High caffeine content can cause anxiety, sleep disruption, and dependency. Safe in moderation for healthy adults.

Natural stimulant that's safe in moderation but can cause anxiety, insomnia, and dependence in sensitive individuals.

The amount is modest compared with coffee. It can disturb sleep and cause jitteriness in sensitive people, and children should limit it.

At 80mg it's comparable to a cup of coffee and fine for most healthy adults. It can cause anxiety, sleep disruption, and raised heart rate, and it adds up quickly alongside other caffeine sources.