Theanine Supplements

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L-theanine is an amino acid found naturally in green tea, known for promoting a calm, focused state without the drowsiness of a sedative. It’s often paired with caffeine to take the edge off without losing the alertness — the same balance you get from a cup of green tea. You’ll find it here as capsules, chewables, powders, and combination formulas with magnesium or GABA, including the branded Suntheanine form. It’s a popular choice for steady, stimulant-free calm.

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    What L-theanine is

    L-theanine is an amino acid found almost uniquely in tea leaves, and it's a big part of why a cup of green tea feels calming rather than just stimulating. It's associated with a "relaxed but alert" state — settled and focused rather than sedated — which is why people reach for it when they want to take the edge off without slowing down.

    L-theanine and caffeine

    This is the pairing L-theanine is best known for. Taken alongside caffeine, it tends to smooth out the jittery edge while keeping the alertness — the same balance nature strikes in green tea, which contains both. Plenty of people add it to their morning coffee for exactly that reason.

    Forms and combinations

    L-theanine comes here as capsules, chewables, and powders, in doses commonly from 100 mg to 250 mg. It also shows up in combination formulas — paired with magnesium or GABA for relaxation blends, for instance. You'll also see the branded Suntheanine form, a specific manufactured version of L-theanine.

    L-theanine in Canada

    L-theanine supplements sold in Canada carry a Natural Product Number (NPN) from Health Canada and ship from our Ontario warehouse to addresses across Canada.

    Safety and side effects

    L-theanine is generally well tolerated. Side effects are uncommon but can include mild headache or dizziness, and it may lower blood pressure slightly. If you're pregnant, taking medication, or managing a health condition, check with your healthcare provider before use.

    L-Theanine FAQs