By CoffeeWeekly.com Editorial Team
Caffeine guide at a glance
Key number: FDA cites 400 mg a day for most adults, not as a target or a universal safe limit.
Start with milligrams, not cups
Cup size and brew strength vary. The FDA cites 400 mg per day for most adults as an amount not generally associated with negative effects, but sensitivity, medicine, conditions, and pregnancy can change what is appropriate.
FDA lists regular brewed coffee at roughly 113–247 mg per 12 fluid ounces and decaf at about 2–15 mg per 8 ounces. See the current FDA caffeine guide.
Build your personal total
- Write down the serving size you actually drink.
- Use the product’s stated caffeine amount when available.
- Add tea, soda, energy drinks, chocolate, supplements, and medicines.
- Track sleep, anxiety, stomach symptoms, headache, and heart-racing sensations.
Mushroom coffee is not automatically low caffeine
Some blends contain less coffee per serving, but formulas differ. “Mushroom coffee” is not a regulated caffeine tier. Check the milligrams and the prepared serving size.
When to ask for help
Ask a clinician about caffeine if you are pregnant or breastfeeding, take interacting medicine, have a heart rhythm concern, or experience troublesome symptoms. Pure or highly concentrated caffeine is a different and potentially dangerous product.
Last reviewed August 27, 2026. Coffee Weekly provides general education, not medical advice. If caffeine or a mushroom ingredient may affect a condition, medicine, pregnancy, breastfeeding, or surgery, ask a qualified health professional.