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SMART CAFFEINE *
Slow-release caffeine. Improved release profile for longer effects on concentration, without caffeine dips and spikes. With L-Theanine, pantothenic acid, vitamin B6 and zinc. Suitable for vegans and vegetarians. * Pantothenic acid contributes to normal mental performance.
- Smart Caffeine.
- With CaffXtend® raw material.
- Slow-release caffeine: Longer-lasting effects without spikes.
- Suitable for vegetarians and vegans.
- With L-theanine, pantothenic acid, vitamin B6, and zinc.
Table of contents

HSN Introduces Smart Caffeine. Your best ally in your study sessions
Smart Caffeine by EssentialSeries is a food supplement in vegetable capsules, based on a combination of natural caffeine anhydrous from coffee beans, the amino acid L-Theanine, pantothenic acid, vitamin B6, and zinc.
Caffeine is the most widely used alkaloid in the world through the extensive use of drinks such as tea and coffee. L-theanine is the main amino acid constituent of the leaves of the tea plant (Camellia sinensis).
This product is made from ingredients that are 100% free from traces of animal derivatives.
Smart Caffeine is a product suitable for vegetarians and vegans.
Intelligent caffeine contains CaffXtend® for the best effects
CaffXtend®
The caffeine in this formula is CaffXtend®. A unique ingredient, as it is released over 12 hours thanks to a patented technology (according to Inventia Healthcare Ltd, the brand's proprietary company).

Why do we use CaffXtend® in our improved smart caffeine?
Immediate-release caffeine is not the best option when it comes to using caffeine for studying, as its effect is fast and intense, but it does not last over time and after a few hours fatigue sets in quickly and unexpectedly, making you feel a 'dip'. This is what we called a 'caffeine crash'.
As CaffXtend® is released for much longer than immediate-release caffeine:
Up to 12 hours vs minutes.

Its effects are more sustained over time, something that has been highlighted by recent studies showing that, although total caffeine absorption is identical between the immediate and prolonged speed, its effects are better in the case of the prolonged speed several hours after ingestion, and there is no caffeine 'crash' because there are no 'peaks' or ' dips'.
CaffXtend® is the best option for students, and that's why it's the star of our smart caffeine.

Smart Caffeine properties of interest to you as a student
Caffeine
Pantothenic acid
- Pantothenic acid contributes to normal intellectual performance.
- Pantothenic acid contributes to the synthesis and normal metabolism of steroid hormones, vitamin D, and some neurotransmitters.
Vitamin B6
- Vitamin B6 helps to reduce tiredness and fatigue.

Zinc
- Zinc contributes to normal cognitive function.
At HSN we take care of the details: Our smart caffeine is the result of our love of food supplements
Carefully selected doses.
The dose ratio between caffeine and L-theanine is an important factor in establishing the pattern of action of the compound, and the choice of dose is relevant.
Our product contains a dose of 150mg of caffeine and 200mg of L-theanine per capsule.

In vegan capsules
Capsule products sometimes present problems for people who do not consume animal foods, as gelatine is used as a glazing agent.
HSN avoids the use of gelatine in our capsules and instead uses a polymer derived from cellulose, of vegetable origin.

Our capsules are veggies, and smart caffeine is a 100% vegetarian and vegan friendly product.
What products can I combine Smart Caffeine with?
With HSN products such as:
Studies on the subject
- Fisone, G., Borgkvist, A., & Usiello, A. (2004). Caffeine as a psychomotor stimulant: Mechanism of action. Cellular and Molecular Life Sciences, 61(7–8), 857–872.
- Giesbrecht, T., Rycroft, J. A., Rowson, M. J., & De Bruin, E. A. (2010). The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness. Nutritional Neuroscience, 13(6), 283–290.
- Kahathuduwa, C. N., Dassanayake, T. L., Amarakoon, A. M. T., & Weerasinghe, V. S. (2017). Acute effects of theanine, caffeine and theanine–caffeine combination on attention. Nutritional Neuroscience, 20(6), 369–377.
- National Center for Biotechnology Information (s.f.) PubChem Database. L-Theanine, CID=439378, (Recuperado en junio de 2020).
1 In doses of at least 75mg.
2 In doses of at least 75mg.
Nutritional FactsSMART CAFFEINE - 120 veg caps |
| daily doseper serving |
| Serving size: 1 veg caps | ||
| daily dose: 1 veg caps | ||
| Servings per container: 120 | ||
| Daily amount | |||
|---|---|---|---|
| Long-acting natural granulated caffeine (CaffXtend®) | 300mg | ||
| Caffeine | 150mg | ||
| L-Theanine | 200mg | ||
| Pantothenic Acid | 6mg | ||
| of calcium D-pantothenate | 6.5mg | ||
| Vitamin B6 | 1.4mg | ||
| of pyridoxine hydrochloride | 1.6mg | ||
| Zinc | 3mg | ||
| of zinc citrate | 9.6mg | ||
| NRVs (Nutrient Reference Values) established in Regulation (EU) 1169/2011 of 25 October 2011. †† NRVs are not established on this occasion. |
Ingredients
Long-acting natural granulated caffeine [caffeine anhydrous (plant extract from Coffea robusta beans)], L-theanine [from green tea leaf extract (Camellia sinensis)], vegetable capsule [glazing agent (hydroxypropyl methyl cellulose)], rice flour, anti-caking agent (magnesium salts of fatty acids), zinc citrate, calcium D-pantothenate (pantothenic acid), pyridoxine hydrochloride (vitamin B6).
Warnings
Once opened, store in a cool (under 25ºC), dry and dark place. Do not exceed the stated recommended daily dose. Keep out of reach of the smallest children. Nutritional supplements should not be used to replace a balanced diet. It is necessary to maintain a varied and balanced diet and a healthy lifestyle. Contains caffeine (150mg/daily dose). Not advised for children nor pregnant women. Caffxtend® is a registered trademark of Inventia Healthcare Ltd.. Health claim awaiting European authorization.
How to take SMART CAFFEINE - 120 veg caps
Take 1 vegetable capsule, 1 time a day.
The product reviews and opinions published reflect only the customers’ views and experiences. HSN does not verify or endorse such comments or claims, and is not responsible for the content provided in the reviews. Statements regarding food supplements have not been evaluated by the EFSA (European Food Safety Authority) and are not intended to diagnose, treat, cure, or prevent any disease or medical condition.
The product reviews and opinions published reflect only the customers’ views and experiences. HSN does not verify or endorse such comments or claims, and is not responsible for the content provided in the reviews. Statements regarding food supplements have not been evaluated by the EFSA (European Food Safety Authority) and are not intended to diagnose, treat, cure, or prevent any disease or medical condition.
A satisfied customer says:
I love it
Laura 19/02/2024
I am delighted with this long-acting caffeine, as the normal one made me too active. You can feel it throughout the day, and it's ideal for the afternoon and evening shifts.
Show original languageA critical customer says:
It hasn't kept me awake at night.
Cristina 22/02/2024
I bought it as a substitute for coffee in the morning and even taking an extra coffee has not kept me awake at midday. I have to say that I have been taking it for 3 months.
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Caffeine
Miriam 27/11/2025
I always take the regular caffeine, but I decided to try this one and see how it goes. So far I'm doing well.
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Essential for higher performance
Álvaro 13/11/2025
Provides incredible energy. Recommended to be taken with L Theanine and vitamin B. The result is noticeable in the same day.
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GENIUS
JESÚS 14/10/2025
HSN Smart Caffeine has worked very well for me before training or for long days at work. It gives me constant energy without making me nervous or causing a slump afterwards. You can feel the effect quickly and it helps me concentrate better. Also, the capsules are convenient to take and don't taste bad. It's a good choice if you want a clean, long-lasting energy boost.
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Good for study time
Lourdes 06/09/2025
I bought it for my daughter, for exam time, and she says she doesn't have to drink as much coffee to stay awake.
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Brutal long-lasting effect
Manuel 28/08/2025
It lasts for hours and keeps you super focused during those exams or long work sessions that require your mind at 110%, I recommend it.
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