• thecary L-theanine 100mg with caffeine 50mg 60 capsules, calm focus nootropic UK
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thecary

L-Theanine 100mg + Caffeine 50mg — 60 Vegan Capsules

L-Theanine 100mg + Caffeine 50mg — 60 Vegan Capsules

£34.99 GBP
£34.99 GBP
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Taxes included.

Ingredients

L-Theanine, Bulking Agents (Microcrystalline Cellulose, Di-calcium Phosphate), Capsule Shell (Hypromellose, Titanium Dioxide (Glazing Agent)), Caffeine, Anti-caking Agents (Silicon Dioxide, Magnesium Stearate)

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Delivery & Returns

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Capsule Shell

Category

Natural Compound

Microcrystalline Cellulose

Category

Fibre

Di Calcium Phosphate

Category

Mineral

Magnesium Stearate

Category

Natural Compound

L-Theanine

Category

Amino Acid

Caffeine

Category

Alkaloid

Silicon Dioxide

Category

Mineral

Capsule Shell

Protects ingredients from degradation, masks taste/odor, convenient dosage form, allows for specific release profiles.

Key Function

Enclosure for active ingredients, protects contents.

What it's used for

To encapsulate powdered or liquid supplements for oral administration.

Key Benefits

Protects ingredients from degradation, masks taste/odor, convenient dosage form, allows for specific release profiles.

Science Behind It

Capsule shells are typically made from gelatin (animal-derived protein) or hypromellose (HPMC, plant-derived cellulose polymer). They dissolve in the digestive tract, releasing the active ingredients. They protect the encapsulated ingredients from environmental factors like moisture and oxygen, and also mask unpleasant tastes or odors.

Microcrystalline Cellulose

Acts as a fiber (though typically in small amounts in supplements), provides structure to tablets, generally recognized as safe.

Key Function

Bulking agent, binder, disintegrant.

What it's used for

Pharmaceutical and food additive, mainly as an excipient in tablets and capsules.

Key Benefits

Acts as a fiber (though typically in small amounts in supplements), provides structure to tablets, generally recognized as safe.

Science Behind It

Microcrystalline cellulose (MCC) is a purified, partially depolymerized cellulose. It's an inert, insoluble dietary fiber that is not digested or absorbed by the body. In supplement formulations, its primary role is as a binder to hold ingredients together, a filler or bulking agent to increase tablet size, and a disintegrant to help tablets break down in the digestive tract.

Di Calcium Phosphate

Supports bone and teeth health, provides essential calcium and phosphorus.

Key Function

Bone structure, mineral source, bulking agent.

What it's used for

Calcium and phosphorus supplementation, used as a dietary supplement and excipient in tablets.

Key Benefits

Supports bone and teeth health, provides essential calcium and phosphorus.

Science Behind It

Di Calcium Phosphate is a compound containing both calcium and phosphorus, two essential minerals for human health. Calcium is the most abundant mineral in the body, primarily stored in bones and teeth, providing structural integrity. Phosphorus is the second most abundant, also critical for bone and teeth formation, energy metabolism (ATP), and cell membrane structure. In supplements, it acts both as a mineral source and a pharmaceutical excipient (filler/binder).

Magnesium Stearate

Improves manufacturing efficiency, ensures consistent tablet/capsule fill, generally recognized as safe.

Key Function

Lubricant, anti-adherent.

What it's used for

Pharmaceutical and supplement manufacturing aid to prevent ingredients from sticking

Key Benefits

Improves manufacturing efficiency, ensures consistent tablet/capsule fill, generally recognized as safe.

Science Behind It

Magnesium stearate is a salt formed from magnesium and stearic acid, a saturated fatty acid.

L-Theanine

Promotes relaxation and calmness, improves attention and cognitive performance, reduces anxiety, enhances sleep.

Key Function

Neurotransmitter modulator, promotes relaxation without sedation.

What it's used for

Stress reduction, improved focus, enhanced sleep quality, often combined with caffeine to mitigate jitters.

Key Benefits

Promotes relaxation and calmness, improves attention and cognitive performance, reduces anxiety, enhances sleep.

Science Behind It

L-Theanine is an amino acid primarily found in tea leaves. It readily crosses the blood-brain barrier and influences brain wave activity, specifically increasing alpha brain waves, which are associated with a relaxed but alert state. It also modulates neurotransmitters like GABA (an inhibitory neurotransmitter), dopamine, and serotonin, contributing to its calming and mood-enhancing effects. When combined with caffeine, it can smooth out the stimulating effects of caffeine, reducing jitters and improving focus.

Caffeine

Reduces fatigue, improves focus and concentration, enhances physical endurance, mild mood elevator.

Key Function

Central nervous system stimulant.

What it's used for

Energy boost, increased alertness, improved cognitive function, enhanced athletic performance.

Key Benefits

Reduces fatigue, improves focus and concentration, enhances physical endurance, mild mood elevator.

Science Behind It

Caffeine primarily exerts its effects by blocking adenosine receptors in the brain. Adenosine is a neurotransmitter that promotes relaxation and sleepiness. By blocking these receptors, caffeine reduces feelings of fatigue and increases alertness. It also increases the release of other neurotransmitters like dopamine and norepinephrine, contributing to its stimulating effects and improved cognitive function.

Silicon Dioxide

Prevents ingredients from sticking together, improves manufacturing efficiency, generally regarded as safe.

Key Function

Anti-caking agent, flow agent.

What it's used for

Food and supplement additive to prevent clumping and improve powder flow.

Key Benefits

Prevents ingredients from sticking together, improves manufacturing efficiency, generally regarded as safe.

Science Behind It

Silicon dioxide (silica) is a compound of silicon and oxygen. In powdered supplements, it's used as an anti-caking agent due to its high surface area and ability to absorb moisture. This prevents powders from clumping, ensuring that ingredients can be uniformly mixed and accurately dosed, and that powders flow smoothly during manufacturing. It is largely inert and passes through the digestive system unabsorbed.

L-Theanine 100mg + Caffeine 50mg by thecary

thecary's L-Theanine + Caffeine pairs 100mg of L-theanine with 50mg of caffeine in a balanced 2:1 ratio — the most-researched nootropic stack for calm, sustained focus.

L-theanine is an amino acid found naturally in green tea. Caffeine is the world's most-consumed stimulant. Combined at the right ratio, they tend to produce a smoother, more focused state than either compound on its own — often described as "alert relaxation".

Vegan, GMO-free, no artificial fillers, and made in the UK in an FSSC 22000 certified facility. 60 capsules — a two-month supply taken once daily.

What is L-theanine?

L-theanine is an amino acid found almost exclusively in tea leaves (Camellia sinensis), particularly green and black tea. Discovered in 1949 by Japanese researchers, L-theanine has become one of the most-studied "calm focus" ingredients in the nootropic world. It is not a sedative — instead, it is associated with alpha brain wave activity, the state typically associated with relaxed alertness.

Why pair L-theanine with caffeine?

Caffeine is well-known for its stimulating effects, but also for the downsides — jitters, restlessness, energy crashes, and sleep disruption. L-theanine appears to take the edge off caffeine's roughest effects without dampening the focus benefits.

Research on the combination consistently finds:

More sustained focus than caffeine alone
Reduced jitteriness and physical tension
Smoother attention without the typical caffeine "crash"
Faster reaction times and improved task accuracy

The effect is widely understood as a synergy: caffeine provides the alertness, L-theanine provides the calmness. Together, the combination tends to produce a more stable, productive state.

Why this 2:1 ratio?

Most published research uses a 2:1 ratio of L-theanine to caffeine — typically 200mg L-theanine to 100mg caffeine. Our 100mg + 50mg formula maintains the same evidence-based ratio at half the dose, designed for:

People who want a moderate, repeatable daily effect
Those who already drink coffee or tea and want a focus boost on top
Newcomers to nootropic supplementation
Use across a working day rather than as a single high-dose hit

If you want a stronger effect, two capsules deliver the classic 200mg + 100mg research dose. Do not exceed two capsules in a single day or 400mg total daily caffeine from all sources.

What's in our formula

100mg L-theanine — Pharmaceutical-grade L-theanine sourced from premium suppliers.

50mg caffeine — Roughly equivalent to a small cup of brewed coffee, in a precise, predictable dose.

Pure ingredients only — No fillers, flow agents, artificial sweeteners or unnecessary additives.

UK-made, FSSC 22000 certified — Manufactured under strict UK food-safety standards.



How to take L-Theanine + Caffeine

Take one capsule with water, ideally about 30–60 minutes before you want the effects to kick in. Caffeine takes 30–45 minutes to peak in the bloodstream; L-theanine works on a similar timeline.

Best taken in the morning or early afternoon. Avoid taking after 2pm — caffeine has a half-life of 5–6 hours, meaning half of the dose is still in your system at bedtime if you take it late in the day.

For a stronger effect, take two capsules at once (200mg L-theanine + 100mg caffeine) — the classic research dose. Do not exceed two capsules per day or 400mg total daily caffeine from all sources.

Food supplements are not a substitute for a balanced diet and healthy lifestyle.

Important safety notes:

Each capsule contains 50mg of caffeine. People sensitive to caffeine should start with one capsule and monitor effects.
Avoid in pregnancy. Pregnant women should keep total caffeine intake below 200mg daily and consult their GP or midwife before use.
Not recommended for children, adolescents, or those breastfeeding.
Avoid combining with other caffeine sources late in the day.
People with cardiovascular conditions, anxiety disorders, hyperthyroidism, or sleep disorders should consult their GP before use.

  • Made In UK

  • FSSC 22000

  • Vegan

  • GMO Free

  • Science Backed

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FAQ

thecary icon on a background of green leaves with water droplets

What is L-theanine?

L-theanine is an amino acid found naturally in tea leaves. It's associated with alpha brain wave activity — the brainwave state typically linked to relaxed alertness — and is widely used as a "calm focus" supplement.

What does L-theanine + caffeine do?

Caffeine increases alertness and physical energy; L-theanine moderates caffeine's roughest edges (jitters, anxiety, crashes) while preserving the focus benefits. Together, they tend to produce a smoother, more stable state of focused alertness than either ingredient on its own.

Will this give me jitters or anxiety?

The L-theanine in this formula is specifically included to reduce caffeine-related jitters and tension. Most users find it noticeably smoother than equivalent caffeine from coffee or energy drinks. That said, individual sensitivity varies — start with one capsule and see how you feel.

How is this different from coffee?

A typical cup of brewed coffee delivers around 80–100mg of caffeine but no L-theanine, so you get the alertness alongside the jitters. This formula gives you about half a cup of coffee's worth of caffeine paired with a clinical dose of L-theanine — meaning more focus, less restlessness.

When should I take it?

30–60 minutes before you need to focus. Best taken in the morning or before lunch. Avoid taking it after 2pm to prevent sleep disruption.

Can I take it with coffee?

Yes, but watch your total caffeine intake. One capsule (50mg) plus a coffee (80–100mg) puts you at 130–150mg — still well below the safe daily limit of 400mg, but worth tracking if you have multiple coffees throughout the day.

How long does the effect last?

Most people notice the effects for around 4–6 hours after taking a capsule. The exact duration depends on your individual caffeine metabolism, body weight, and tolerance.

Is it suitable for people sensitive to caffeine?

At 50mg per capsule, this is a relatively low dose — roughly half a cup of brewed coffee. Caffeine-sensitive people may still find it stimulating, however, so we'd suggest starting with one capsule mid-morning to assess your response.

Is it vegan?

Yes. The formula is fully vegan, GMO-free, and made in the UK in an FSSC 22000 certified facility. The capsule shell is plant-based.

Can I take it every day?

Yes — at one to two capsules daily, this formula is suitable for daily use. Some people prefer to cycle caffeine (e.g. five days on, two days off) to prevent tolerance build-up. Listen to your body and adjust as needed.

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