Caffeine
Caffeine anhydrousCaffeine citrateCaffeine sodium benzoate
Stimulant
Caffeine is a substance found in many foods and drinks, like coffee, tea, and chocolate. It helps people feel more awake and alert by blocking a chemical in the brain that makes us feel tired.
Moderate Concern
Source: FDA GRAS list
Caffeine can be safe for most people in small amounts, but high doses can cause problems like jitteriness, anxiety, and insomnia.
No result found for this ingredient.
r/fasting
14
Fasting Electrolytes: Amounts, Methods, Side Effects & Insights
The Caffeinated Brain Part 2: The Effect of Caffeine on Sleep-Related Electroencephalography (EEG)-A Systematic and Mechanistic Review.
Chmiel J, Kurpas D
2026
Read on PubMedLast updated: May 16, 2026