Matcha powder contains a concentrated mix of caffeine, antioxidants, amino acids, chlorophyll, fiber, and small amounts of vitamins and minerals. Because you consume the whole tea leaf ground into powder rather than steeping and discarding leaves, matcha delivers significantly higher levels of these compounds than regular brewed green tea.
Caffeine
Matcha contains 19 to 44 mg of caffeine per gram of powder. A standard serving uses about 2 grams, putting a typical cup at roughly 38 to 88 mg of caffeine. That’s comparable to a cup of coffee on the lower end and about half a strong coffee on the higher end. The wide range depends on the grade: ceremonial matcha averages around 46 mg per gram, while culinary grades average closer to 31 mg per gram.
The caffeine in matcha hits differently than coffee because it’s paired with an amino acid called L-theanine, which promotes calm focus rather than the jittery spike many people associate with coffee. This combination tends to produce a steadier, more sustained energy lift over several hours.
Antioxidants and Catechins
Matcha is exceptionally rich in catechins, a family of plant compounds that act as antioxidants. A single cup of green tea brewed from 2.5 grams of leaves contains 240 to 320 mg of catechins total. The most studied of these is EGCG (epigallocatechin gallate), which accounts for 60 to 65% of those catechins. In matcha specifically, EGCG content runs around 22 to 26 mg per gram of powder depending on grade.
These catechins work by neutralizing free radicals, unstable molecules that damage cells. The hydroxyl groups in their chemical structure latch onto free radicals and deactivate them. EGCG also appears to boost the body’s own antioxidant defense systems, increasing the activity of enzymes that protect cells from oxidative stress. In lab studies, EGCG has shown the ability to block DNA synthesis specifically in cancer cells while leaving healthy cells alone, though human research is still catching up to those findings.
To put matcha’s antioxidant power in perspective, it scores around 1,384 ORAC units per gram. ORAC (Oxygen Radical Absorbance Capacity) is a lab measure of how well a substance neutralizes free radicals. That’s substantially higher than most fruits and vegetables on a per-gram basis.
Amino Acids
Matcha is unusually rich in free amino acids compared to other teas, and this is largely a result of how it’s grown. Tea plants destined for matcha are shaded for weeks before harvest, which drives up amino acid production while reducing certain bitter compounds.
The most abundant amino acid is theanine, the compound responsible for matcha’s characteristic umami flavor and its calming cognitive effects. Ceremonial-grade matcha can contain over 1,500 mg of theanine per 100 grams of powder, more than double what you’d find in regular green tea (600 to 800 mg per 100g). Arginine is the second most abundant, reaching over 330 mg per 100g in premium matcha versus under 120 mg in standard green tea. Other notable amino acids include glutamic acid, aspartic acid, and serine, all of which contribute to matcha’s savory, full-bodied taste.
Total free amino acid content in ceremonial matcha can reach about 3,800 mg per 100 grams, compared to roughly 2,000 to 2,500 mg in lower-grade matcha or regular green tea.
Chlorophyll
The vivid green color of matcha comes from chlorophyll, and shading the tea plants before harvest is what makes it so intensely green. When tea plants receive less sunlight, they compensate by producing more chlorophyll to capture whatever light is available. Ceremonial-grade matcha averages about 4.09 mg of chlorophyll per gram, while culinary-grade matcha contains roughly 2.72 mg per gram. This is one of the clearest visual markers of quality: brighter, more vivid green generally signals higher chlorophyll and a more carefully shaded tea.
Fiber, Vitamins, and Minerals
Because you’re consuming the entire leaf, matcha delivers a surprising amount of dietary fiber. One gram of matcha powder contains about 1 gram of fiber, so a standard 2-gram serving provides 2 grams. That’s a meaningful contribution from such a small amount of food, though it won’t replace whole grains or vegetables as your primary fiber source.
A 2-gram serving also provides 580 micrograms of beta-carotene (a precursor to vitamin A), 54 mg of potassium, and 1 mg of vitamin C. The vitamin and mineral amounts are modest in absolute terms, but they come essentially free alongside the more potent bioactive compounds. The calorie count is negligible: about 3 calories per gram.
Ceremonial vs. Culinary Grade
The grade of matcha you buy changes what you’re actually consuming in meaningful ways. Ceremonial matcha is made from younger leaves, shaded longer, and stone-ground more carefully. It contains significantly more caffeine (about 46 mg/g vs. 31 mg/g), more chlorophyll, and dramatically more theanine and other amino acids. This is the grade that delivers the smoothest flavor and the most pronounced calm-focus effect.
Culinary matcha, somewhat counterintuitively, actually contains more total phenolic compounds and flavonoids. Culinary grades averaged 81 mg/g of total phenolics compared to 63 mg/g for ceremonial, and about twice the flavonoid content. Culinary matcha also showed higher antioxidant capacity in lab testing. This likely reflects the use of more mature leaves, which accumulate more of these protective compounds. EGCG levels were slightly higher in culinary matcha as well, though the difference wasn’t statistically significant.
So if your primary goal is antioxidant intake, culinary matcha actually delivers more. If you want the amino acid profile, the smoother flavor, and the caffeine-theanine synergy, ceremonial grade is the better choice.
Heavy Metal Contamination
One concern worth knowing about is that tea plants, including those used for matcha, absorb heavy metals from soil. Independent lab testing of popular matcha brands has found detectable levels of lead and cadmium in many products. Because you consume the whole leaf rather than discarding it after steeping, your exposure to any contaminants in the leaf is higher with matcha than with regular tea.
The practical risk depends heavily on how much you drink and where the matcha is sourced. Japanese matcha tends to have lower heavy metal levels than matcha from regions with more polluted soils. If you drink matcha daily, choosing a brand that provides third-party lab testing for contaminants is a reasonable precaution, especially for pregnant women and children who are more sensitive to heavy metal exposure.