Carbohydrate Drink Mixes

The backbone carbohydrate — a glucose polymer that hydrolyses rapidly to free glucose in the small intestine. DE 10-15 is optimal: low enough DE to avoid cloying sweetness at 33 g/serving, high enough to dissolve readily in cold water. Critically, maltodextrin contributes fewer osmoles per gram of carbohydrate than glucose or sucrose, enabling high carbohydrate concentrations without excessive osmolality. At 33.3 g per 750 mL bottle, maltodextrin contributes ~4.4 g/100 mL — well within the gastric emptying-friendly zone.

Fructose activates the GLUT-5 intestinal transporter independently of SGLT-1, enabling total carbohydrate absorption beyond the ~60 g/h glucose ceiling. At 26.7 g alongside 33.3 g maltodextrin, the glucose:fructose ratio is 1.25:1 by weight — producing a glucose-equivalent-to-fructose ratio of approximately 1:0.8 when accounting for maltodextrin molecular weight. Important regulatory note: fructose exceeds one-third of total carbohydrate in this formula. Under EU Regulation 1924/2006 Annex, this may require an advisory statement for commercial products. For personal athlete use, this is not a concern.

The primary sodium source in this formula, contributing ~225 mg sodium per serving. Sodium citrate is preferred over a pure chloride approach at these concentrations because citrate salts are significantly milder in flavour — at 225 mg sodium from citrate vs chloride, the citrate form avoids the sharp, briny taste that makes high-sodium drink mixes unpalatable. Citrate also acts as an alkalising buffer, partially countering citric acid and contributing to the final mixed-solution pH of 3.5–4.0.

Contributes ~300 mg sodium alongside the chloride anion. Sweat contains chloride at approximately 40–60 mmol/L — replacement is important for maintaining plasma electrolyte balance during prolonged exercise. Combined with sodium citrate, total sodium reaches ~525 mg per 750 mL serving, equivalent to ~700 mg/L. This falls within the EU carbohydrate-electrolyte solution band (20–50 mmol/L = 460–1,150 mg/L) and replaces a meaningful proportion of average sweat sodium losses.

Contributes ~150 mg potassium. Sweat potassium losses (150–500 mg/L) are lower than sodium on a per-volume basis, but potassium plays a critical role in muscle contraction and fluid distribution between intracellular and extracellular compartments. At 150 mg per bottle, this formula replaces approximately 30–100% of typical sweat potassium losses per 750 mL consumed — adequate for most scenarios without risking hyperkalaemia.

Delivers ~32 mg elemental magnesium per serving. Magnesium is involved in over 300 enzymatic reactions and is critical for muscle function and glycolysis. Exercise increases urinary magnesium excretion, and marginal deficiency is common in endurance athletes. Citrate form is preferred: magnesium oxide and sulphate have significant laxative effects at higher doses; citrate is well-absorbed and GI-friendly at this dose. At 32 mg per serving, this formula contributes ~8% of the RDA — a supplementary addition, not primary replacement.

Targets a mixed-solution pH of 3.5–4.0 in 750 mL water. In powder form, citric acid provides acidic flavour contribution before dissolution. In solution, it drives tartness that balances the sweetness of fructose and maltodextrin, improving palatability significantly — particularly at high carbohydrate concentrations where sweetness fatigue can limit intake. The acidic pH also inhibits microbial growth in the dry powder (hygroscopic powders are vulnerable).

Anti-caking agent used at 0.1% of powder weight — within the standard ≤2% food-use limit. Fructose and maltodextrin are hygroscopic: they absorb atmospheric moisture and clump aggressively. Without silicon dioxide, the powder blend becomes unusable within days of production in humid conditions. At 0.1 g per 63 g serving, the contribution to the final beverage is negligible but its impact on powder flowability and scoop accuracy is significant. Do not omit this ingredient.