Caffeine 101
Natural caffeine vs. synthetic caffeine
Same molecule, very different company. What comes alongside your caffeine is the part that changes how a drink feels.
5 min read
Caffeine is caffeine: chemically, the molecule extracted from a green tea leaf is identical to the one produced in a lab. What differs is the source, everything that travels with it, and how quickly it arrives.
Where naturally sourced caffeine comes from
Naturally sourced caffeine is extracted from plants that already make it — coffee beans, tea leaves, guaraná seeds, yerba mate, kola nut, cacao. Because it's extracted rather than synthesized, it usually arrives alongside other compounds from the same plant, such as the polyphenols in tea or the tannins in guaraná.
Synthetic caffeine is manufactured — typically from urea and chloroacetic acid — and is common in sodas, energy shots and many mainstream energy drinks because it is inexpensive and easy to dose precisely. Labels often list it simply as “caffeine” or “caffeine anhydrous.”
Does the source change how it feels?
The honest answer: the molecule behaves the same way in your body. What can differ is the rest of the formula. A drink built on synthetic caffeine plus sugar delivers a fast blood sugar spike alongside the stimulant, and the crash people describe is often the sugar as much as the caffeine. A drink built on plant-sourced caffeine with no sugar has fewer moving parts.
Compounds that ride along with plant caffeine can also matter. Green tea naturally contains L-theanine, an amino acid frequently paired with caffeine for its smoothing effect.
How to read a label
- Look for the source. “Caffeine from green tea extract” tells you more than “caffeine.”
- Check the total milligrams per can, not per serving — some cans contain two servings.
- Count the ingredients. Long lists usually mean more sweeteners, preservatives and acids.
- Check the sugar line. Sugar, not caffeine, drives most of the spike-and- crash pattern.
How Cómo No approaches it
Cómo No is a caffeinated sparkling water made with six ingredients. Each can contains 100mg of naturally sourced caffeine — 80mg from green tea and 20mg from guaraná — plus 100mg of L-theanine, with zero sugar and zero calories. For the full breakdown, see the ingredients page.
For reference, the U.S. Food and Drug Administration cites 400mg of caffeine a day as an amount not generally associated with negative effects for healthy adults. Individual tolerance varies, and people who are pregnant, nursing or sensitive to caffeine should speak with a physician.