The product contains the colorants quinoline yellow (E104) and sunset yellow (E110), for which EU legislation requires a mandatory warning that they may have an adverse effect on children's activity and attention – this warning is also stated on the product's own label. For this reason, we do not recommend this product for regular consumption by children. In addition, the product contains guarana extract, a natural source of caffeine, which is also not suitable for children. If you're looking for an isotonic drink for a child, choose a product without these two colorants and without caffeine sources, and consult a pediatrician if needed.

Yes, guarana seed extract (Paullinia cupana) is a natural source of caffeine, but the manufacturer does not state the exact amount of caffeine per serving on the label, which makes precise dosing difficult, especially for people sensitive to caffeine, pregnant women, or breastfeeding mothers, for whom regular caffeine consumption is not advised. Dietary supplements can sometimes be a source of unexpected ingredients due to raw material variability (Dietary Supplements as a Major Cause of Anti-doping Rule Violations, PMC8990797, 2022), so it makes sense to factor in this unknown caffeine amount when calculating your total daily caffeine intake from coffee, tea, and other sources if you are sensitive to it.

Yes – at the recommended dilution (31.5 g per 700 ml of water), the sodium content (350 mg per serving) reaches approximately 21-22 mmol/L, which is within the recommended range of 20-50 mmol/L for electrolyte replacement during exercise (McCubbin, 2025). So the lower price of this product does not come at the expense of sodium content, which is actually well positioned within the recommended range for this product. The compromises in this product lie elsewhere – primarily in the form of magnesium used and the added synthetic colorants and sweetener.

Magnesium carbonate is a less soluble, less bioavailable form of magnesium compared to citrate or glycinate forms (Chronic Organic Magnesium Supplementation…, PMC12847085, 2025). In this product, magnesium (60 mg per serving) is not the main active ingredient but a supporting electrolyte within the overall isotonic profile, so the impact of lower absorption is less critical than in a standalone magnesium supplement, where the goal is to reach a specific daily magnesium intake. If magnesium matters to you primarily for its role, we recommend a separate supplement with magnesium citrate or bisglycinate, and treating this isotonic drink mainly as a source of sodium and potassium.