Below is a handy guide that compares how much caffeine can be found in coffee and tea, corresponding to the ratings given for OXALIS products (low, medium and high).
Effects of caffeine from tea and coffee
The caffeine in coffee kicks in quickly but wears off just as fast. Tea does it differently, as the boost of energy it gives comes on gradually and lasts longer.
Caffeine in 1 gram of coffee:
LOW CONTENT <6 mg caffeine
MEDIUM CONTENT 6 - 10 mg caffeine
HIGH CONTENT >10 mg caffeine
Taking 13 g of coffee grains per 250 ml of water (1 cup) as a measure, the recommendation is to drink a maximum of 1-2 of such cups per day brewed from coffee labelled as high in caffeine. It is also necessary to consume a sufficient amount of liquid every day, follow a varied, balanced diet and have a healthy lifestyle.
Caffeine in 1 gram of tea:
LOW CONTENT 1-15 mg caffeine
MEDIUM CONTENT 16-29 mg caffeine
HIGH CONTENT >30 mg caffeine
Taking 12 g of tea per 1 litre of water as a measure, the recommendation is to drink a maximum of 1 litre per day of tea labelled as high in caffeine. When consuming it, 250-500 ml of such tea should be consumed at one time, meaning a maximum of 4 servings of 250 ml per day. It is also necessary to drink a sufficient amount of liquid every day, follow a varied, balanced diet and have a healthy lifestyle.
The European Food Safety Authority states that a single dose of caffeine should not exceed 200 mg. A maximum intake of 400 mg per day is recommended.
More information on the topic from the European Food Safety Authority (EFSA) is available here: https://www.efsa.europa.eu/en/topics/topic/caffeine