Daily calcium needs vary: most adults 19–50 require 1,000 mg, women over 50 and men over 70 need 1,200 mg. The NHS recommends 700 mg for adults 19–64.

Even a 100 mg dose of caffeine can disrupt sleep if consumed within six hours of bedtime, though individual sensitivity varies widely.

Caffeine affects people differently, but research shows consuming as little as 100 mg within 6 hours of bedtime can disrupt sleep for most people.

A 12-ounce can of Prime Energy packs 200 milligrams of caffeine, roughly the same as six cans of Coca-Cola or about two and a half cans of Red Bull.

Caffeine passes into breast milk in small amounts, typically about 1% of the maternal dose.

Dark chocolate contains about 12 milligrams of caffeine per ounce, while milk chocolate has roughly 9 milligrams — far less than a typical cup.

The toxic dose of caffeine for dogs is roughly 140 milligrams per kilogram of body weight.

A standard 12 fl oz Celsius Original contains 200 mg of caffeine, while Celsius Heat has 300 mg and Celsius Essentials has 270 mg per can.

Most health authorities suggest keeping caffeine under 200–300 mg per day while breastfeeding.

For most healthy adults, up to 400 mg of caffeine per day—roughly four cups of brewed coffee—is generally considered safe.