That's half the limit proposed by the Health Canada team. As a point of reference, a 2-oz shot of 5-Hour Energy contains 215 mg of caffeine, a can of Monster ~260 mg. 200 mg/day is also the upper caffeine limit recommended by the American College of Obstetricians and Gynecologists.
http://io9.gizmodo.com/5982468/how-much-caffeine-is-too-much
A lethal dose of caffeine is thought to be roughly 10 grams — about the mass of your standard #2 pencil. That converts to a whopping (but basically undrinkable) 4.69 gallons of coffee, or 120 standard cans of Red Bull.
http://io9.gizmodo.com/5982468/how-much-caffeine-is-too-much
The less caffeine you consume, the better. Some experts say more than 150 mg of caffeine a day is too much, while others say more than 300 mg a day is too much. Avoiding caffeine as much as possible is your safest course of action.
http://americanpregnancy.org/pregnancy-health/caffeine-during-pregnancy/
In 2003, a team at Health Canada, a government regulatory agency, reviewed more than 200 studies about caffeine's effects on human health. On the basis of the survey, the team concluded that 400 mg of caffeine per day (or about three 8-oz cups of brewed coffee) is a safe dose for healthy adults to consume. At and below this level, the average person does not experience negative mood changes or heart problems, the report stated.
http://io9.gizmodo.com/5982468/how-much-caffeine-is-too-much
What Happens When You Consume Too Much Caffeine? Consuming more than 300 milligrams of caffeine per day may give you the caffeine jitters, which is that jumpy and slightly alarmed feeling. Larger amounts of caffeine may make you irritable, sleepless, and may even trigger anxiety and cause diarrhea.
https://www.verywell.com/what-are-the-side-effects-of-too-much-caffeine-2506047
Caffeine is a stimulant and a diuretic. Because caffeine is a stimulant, it increases your blood pressure and heart rate, both of which are not recommended during pregnancy. Caffeine also increases the frequency of urination. This causes reduction in your body fluid levels and can lead to dehydration.
http://americanpregnancy.org/pregnancy-health/caffeine-during-pregnancy/
Due to conflicting conclusions from numerous studies, the March of Dimes states that until more conclusive studies are done, pregnant women should limit caffeine intake to less than 200 mg per day. This is equal to about one 12 oz cup of coffee.
http://americanpregnancy.org/pregnancy-health/caffeine-during-pregnancy/
How Much Caffeine Is Safe? It seems that experts who study caffeine agree that consuming up to 300 milligrams of caffeine per day is safe -- for adults anyway. That's roughly the amount of caffeine you would get from three cups (not mugs or big paper cups) of coffee.
https://www.verywell.com/what-are-the-side-effects-of-too-much-caffeine-2506047
One of the more recent studies to examine this risk was published in 2008 in the American Journal of Obstetrics and Gynecology, and concluded that the risk of miscarriage is more than double in women who consume over 200 mg of caffeine per day.
http://io9.gizmodo.com/5982468/how-much-caffeine-is-too-much
Answer: Caffeine -- usually in the form of coffee, tea, caffeinated sodas and energy drinks -- is often consumed to increase cognitive functioning and improve a bad mood. Judging by the length of the waiting line at Starbucks, this must be especially true in the mornings.
https://www.verywell.com/what-are-the-side-effects-of-too-much-caffeine-2506047
how many milligrams of caffeine can be safely consume in one day
400 mg of caffeine can be safely consumed in one day. 400 milligrams of caffeine can be safely consumed in one day.