REZ helps you boost your energy, focus, and motivation — sugar-free, no crash, no calories. It's an alternative to endless coffee and overly sugary energy drinks.

Yes, absolutely. That's actually what the majority of our customers do: replace coffee or cans with something more effective, easier to digest, healthier, and with a really cool taste.

You'll generally feel the effects 15 to 25 minutes after your shake. You'll experience a gradual increase in energy and focus, without any sudden rush or unpleasant comedown.

Yes. Even if you're not at the gym, you can take it at work, in class, for gaming, or to stay focused. REZ is designed to accompany all active days, whether you're into sports or not.

Yes, absolutely. REZ contains caffeine, tyrosine, and B vitamins, known to improve focus and alertness. Many of our customers take it to stay productive at work or school.

No more than 2 per day is the recommended dose to maintain a reasonable caffeine intake.

1. When you need a boost:

– Upon waking up, to get a full start

– Before a training session

– In the middle of the afternoon to avoid the afternoon slump

→ Avoid after 6pm if you are sensitive to caffeine.

Yes, but ideally you should use 300 to 500 ml of very cold water. Some people try sparkling water, coconut water, or ice cubes. Avoid overly sweet liquids like syrups.

Not necessarily. You can take it when you feel the need. Some people take it every day, others only before sports or on busy days.

For a perfect mix, a good shaker with a mixing grid or ball is recommended. You can find them on the website.

Sucralose, a calorie-free sweetener, is used to add flavor without impacting your blood sugar.

There is 0.2g of sugar per 10g serving — an amount naturally present in some ingredients of the formula (in natural flavors and colors).
It's so tiny that it's equivalent to less than 1/20th of a sugar cube. For comparison, an apple contains about 10g, a can of soda more than 30g.

So yes, REZ is legally widely considered to be sugar-free, and you can consume it even if you are watching your sugar intake or following a low-carb diet.

REZ is vegan in its composition, but may contain traces of milk, as indicated on the label (related to the production lines).

The flavors and colors are 100% natural. The rest of the formula (such as certain amino acids, vitamins, or caffeine) is synthetic, but safe, stable, and perfectly controlled—as in most quality supplements. No ingredients of animal origin, nor any unnecessary or questionable substances.

No major allergens. But if you have a specific allergy, always check the full list of ingredients on the jar.

No, the caffeine we use is synthetic. We made this choice for two simple reasons: – Natural caffeine (extracted from tea or coffee) has a very bitter taste, which makes flavors much more difficult to work with. – The synthetic version is identical at a molecular level, but more neutral in taste and more stable over time. This is the choice of most reputable supplement brands — it allows for a cleaner-tasting product, better control over the dosage, without impacting effectiveness.

Yes. Made in France in a site certified to FSSC 22000, an international food safety standard.

€3.97 at a collection point, €5.97 for home delivery. Free shipping on orders over €40. Orders placed before 3:30 pm (Monday to Friday) are shipped the same day. Delivery in 48 to 72 business hours with Colissimo.

Credit card, PayPal, Apple and Google Pay (100% secure payments).

You choose the frequency and quantity, and you automatically receive your REZ with a discount. You can pause, modify, or cancel whenever you want.

Yes, with one click from your customer area. You can change the date, flavor, frequency, or cancel.

You'll receive an email with a tracking link as soon as your order is shipped. Otherwise, log in to your account to check the status.

Yes: not recommended for children, pregnant or breastfeeding women, and people undergoing medical treatment. Always ask your doctor for advice if in doubt.

Not recommended. As a precaution, seek advice from a healthcare professional.

REZ is made in France. Production, storage, offices: everything is located in France.

REZ is manufactured in a French laboratory certified to FSSC 22000, an international standard that guarantees a high level of food safety. Each batch undergoes strict controls to ensure the quality, stability, and conformity of the product, from formulation to packaging. Formulation, dosage, traceability—everything is monitored and validated within an ultra-rigorous framework.

You can contact us at any time by email at info@rezenergydrink.com or by phone at 09 81 87 54 20. We are here to help you, and we respond quickly, always with pleasure.