\u201cIn short, it enhances mental clarity and reduces anxiety without making you drowsy,\u201d Barr told Verywell. \u201cThat can improve focus indirectly by reducing mental noise and tension<\/a>.\u201d\n<\/p>\n This effect can be especially beneficial under pressure.\n<\/p>\n “L-theanine supports focus by increasing brain wave activity associated with relaxed alertness,\u201d said Oscar Coetzee, MS, DCN<\/a>, senior director of clinical education at Designs for Health.\u00a0\n<\/p>\n \u201cIt also influences dopamine and serotonin<\/a>, supporting a balanced mood and reducing stress-induced distractions,\u201d he added.\n<\/p>\n Together, these mechanisms may help clear mental fog<\/a> and promote steady concentration, especially when you need to stay sharp without feeling overstimulated.\n<\/p>\n How Does Coffee Affect Attention Span? <\/p>\n Caffeine<\/a>, the main active compound in coffee, helps you feel alert by blocking adenosine, a brain chemical that makes you sleepy. When caffeine steps in, your brain accelerates its activity and releases more \u201cfeel-good\u201d chemicals like dopamine and norepinephrine.\n<\/p>\n That\u2019s what gives you the familiar caffeine buzz\u2014sharper focus, quicker thinking, and an overall energy lift.\n<\/p>\n Caffeine also stimulates the adrenal system, triggering a process called gluconeogenesis, which is the release of stored energy into the bloodstream. According to Coetzee, this fuels the brain with more glucose, which in turn boosts levels of key neurotransmitters like dopamine and norepinephrine.\u00a0\n<\/p>\n \u201cThe result is improved alertness, reaction time, and mental energy,\u201d he said\n<\/p>\n Still, caffeine\u2019s benefits can come with trade-offs. \u201cCaffeine\u2019s effects can also increase heart rate and jitteriness, particularly in those who are sensitive or consume it on an empty stomach,\u201d said Barr.\u00a0\n<\/p>\n What Happens When You Mix Them Together? <\/p>\n Combining L-theanine and caffeine appears to create a synergistic effect, with each one enhancing the other\u2019s benefits while minimizing the downsides.\u00a0\n<\/p>\n Evidence supports this: Research shows that pairing 200 milligrams (mg) of L-theanine with 160 mg of caffeine, roughly the amount in a strong cup of coffee, improves attention-switching accuracy, reaction time, and sustained focus compared to caffeine alone.\n<\/p>\n \u201cL-theanine can smooth out the overstimulating effects of caffeine by promoting relaxation without sedation,\u201d said Coetzee. \u201cThis powerful combo often leads to what\u2019s called calm focus, where you get clarity and alertness from caffeine, without the jittery edge.\u201d\n<\/p>\n He added that this makes it easier to focus, switch between tasks, and maintain attention.\u00a0\n<\/p>\n Are There Risks to Consider? <\/p>\n Combining L-theanine and caffeine is safe and well-tolerated for most healthy adults.\u00a0\n<\/p>\n \u201cThere are no known adverse interactions,\u201d says Coetzee. \u201cHowever, individual responses can vary. Those who are highly sensitive to caffeine or L-theanine may experience mild gastrointestinal discomfort, headaches, or changes in blood pressure<\/a>.\u201d\n<\/p>\n According to Barr, people with low blood pressure should be cautious, as L-theanine may lower it further. “Individuals taking medications that affect serotonin, dopamine, or blood pressure should consult their physician before supplementing,\u201d he said.\n<\/p>\n If you\u2019re new to the combination, Coetzee recommends starting small: \u201cTry a low dose (100 mg of L-theanine to match 100 mg of caffeine) to assess personal tolerance.\u201d<\/p>\n![\"Kathleen](\"https:\/\/www.newsbeep.com\/uk\/wp-content\/uploads\/2025\/07\/KFheadshot-9fe00fcb29c24a589a05cb7dea9ca150.jpeg\")
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