Rez® helps 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 effect 15 to 25 minutes after your serving.
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 to work, in class, for gaming or to stay focused. Rez® is designed to accompany all active days, 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 stay within a reasonable caffeine consumption, especially if you consume it daily.

When you need a boost:

• Upon waking up, to start strong
• Before a training session
• In the middle of the afternoon to avoid the afternoon slump

Avoid after 6pm if you're 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 flavour 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 flavours 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 flavours 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 tub.

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 flavours much harder to work with.
• The synthetic version is identical at the molecular level, but more neutral in taste and more stable over time. It is the choice of the majority of serious supplement brands.
• This allows for a cleaner-tasting product, better controlled dosage, without impacting effectiveness.

Yes. Made in France at an ISO 22000 certified site, an international food safety standard.

• €3.97 at a collection point
• €5.97 for home delivery
• Available with purchases of €39.99 or more.

Orders placed before 3:30 pm (Monday to Friday) are shipped the same day and delivery is estimated at 48/72 working 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, flavour, 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 ISO 22000, an international standard that guarantees a high level of food safety.

Each batch undergoes rigorous controls to ensure product quality, stability, and conformity, from formulation to packaging. Formulation, dosage, traceability—everything is monitored and validated within an ultra-rigorous framework.

You can contact us:

• Directly via the site's chat
• By email to info@rezenergydrink.com
• By phone at 09 81 87 54 20 (from 9am to 4:30pm Monday to Friday).

We're here to help you, and we respond quickly, always with pleasure.