The Sports Drink Problem: Reading the Label Before the Race.

You now know how sodium works in a moving body. You know how much you lose in sweat and how individual that number is. You know the hydration timeline and what heat and altitude do to those numbers. The last question is the practical one: when you pick up a product to help you replace what you're losing, what are you actually getting?

The sports drink and electrolyte market is a multi-billion dollar industry. It is not, as a whole, designed primarily around physiology. It is designed around palatability, shelf life, perceived value, and consumer behavior research. Those goals sometimes align with what your body needs. Sometimes they work against it. Knowing the difference requires reading the label rather than the marketing.

The Sodium Math: Most Products Are Underdosed

The first number to check on any electrolyte product is sodium. Given what we established in Part 2 — sweat sodium concentrations ranging from 460 to 1,840 mg per liter, with a reasonable population average around 900 to 1,000 mg/L — the relevant question is: how much sodium is this product delivering per serving, and is that adequate for my sweat rate and duration?

Many mainstream sports drinks contain 100 to 160 mg of sodium per 12-ounce serving. Tablet-style electrolyte supplements frequently deliver 100 to 300 mg per tablet. For athletes doing short, moderate-effort workouts in cool conditions, this may be adequate. For athletes with high sweat rates, in heat, during prolonged effort, or those who are known salty sweaters, these doses are often significantly insufficient.

Products positioned for "serious" endurance athletes or medical applications typically offer 500 to 1,000 mg of sodium per serving — a number that actually maps to meaningful sweat sodium replacement at realistic sweat rates. This is the range to look for when the effort is long, hot, or high-intensity.

Check the label for serving size versus container size. A product with 300 mg of sodium might appear adequate until you notice that it is split across two servings in a standard bottle, delivering 150 mg per 8 ounces of fluid.

Carbohydrate Concentration and Gastric Emptying

Most commercial sports drinks contain carbohydrates — typically 6 to 8 grams per 100 mL, or a 6–8% solution. This concentration range is physiologically deliberate: research has established that 6–8% carbohydrate solutions empty from the stomach at approximately the same rate as water, allowing for efficient fluid absorption while simultaneously delivering fuel.

Concentrations above 8% slow gastric emptying. This is why fruit juice, most sodas, and concentrated energy drinks are poor choices during intense exercise — the high sugar concentration sits in the stomach, causing bloating and discomfort while delaying fluid absorption at exactly the moment you need it most.

For efforts under 60 to 75 minutes at high intensity, or any effort under moderate intensity regardless of duration, carbohydrate in your electrolyte drink is largely unnecessary from a fuel standpoint — your glycogen stores are adequate. For longer efforts and racing scenarios, the carbohydrate becomes more meaningful. This is why having both carbohydrate-containing and carbohydrate-free electrolyte options is useful: matching the product to the session type rather than using a one-size approach.

Citric Acid: A Common Additive Worth Understanding

Citric acid appears in the majority of sports drinks and many electrolyte supplements — it contributes tartness, acts as a preservative, and extends shelf life. From a formulation standpoint, it does its job well. From a health standpoint, it warrants closer attention than the sports drink industry typically provides.

The citric acid used in food and beverage manufacturing is not extracted from citrus fruit. It is produced through industrial fermentation — primarily using Aspergillus niger, a mold — on a substrate of corn-derived glucose. The final product is chemically identical to naturally occurring citric acid from fruit, but the production process and substrate leave a small residue of fungal proteins that some individuals react to.

For most athletes, this is not a concern. For people with Mast Cell Activation Syndrome (MCAS), certain allergies, or significant chemical sensitivities, synthetic citric acid is a well-documented trigger. Research and patient population data collected by organizations focused on MCAS have consistently identified it as one of the most commonly problematic additives for sensitive individuals.

Beyond sensitivity concerns, research published in the British Journal of Sports Medicine has documented that the low pH of citric acid-containing sports drinks — typically pH 2.4 to 3.5 — is associated with dental erosion in athletes who consume these products regularly in high volumes. Athletes who use electrolyte drinks throughout the day, not just during exercise, may want to be mindful of this. Rinsing with water after consumption reduces but does not eliminate the risk.

Artificial Colors and "Natural Flavors"

The neon colors of mainstream sports drinks serve no physiological function — they are a branding decision. The artificial dyes used (commonly Red 40, Blue 1, Yellow 5, and Yellow 6) have been extensively reviewed for safety at typical consumption levels. Current FDA and EFSA assessments have not found evidence of harm in most of the general population. Some studies have noted behavioral effects in children and reactions in individuals with sensitivities, but the clinical significance for healthy adults is low.

The more ambiguous term is "natural flavors." Under FDA labeling rules, natural flavors must be derived from natural sources — fruit, vegetables, meat, seafood, dairy, fermentation products — but the definition is broad enough that the actual compound used may be highly processed, concentrated, or derived from a source unexpected by the consumer. A "natural flavor" from a seafood fermentation process could legally appear in a product without the label indicating shellfish content, which is a meaningful issue for individuals with crustacean allergies or sensitivities.

"Natural flavor" is, in essence, an opaque category. It can mean something relatively simple, or it can be a chemically complex proprietary blend. For most athletes, it is not a meaningful concern. For those managing complex food sensitivities, it represents exactly the kind of ingredient opacity that makes selecting safe products difficult.

What to Actually Look For

Given the range of products on the market and the variability in how they are formulated, here is a practical framework for evaluating an electrolyte product:

• Sodium content per serving: Match the dose to your needs. 100–200 mg for short/mild efforts. 500–1,000 mg for long, hot, or high-sweat sessions. A single serving should match your loss rate, not represent a tiny fraction of it.
• Ingredient list length: A product that requires 25 ingredients to be palatable is doing something different than one that uses eight. Neither is automatically good or bad, but shorter lists are usually more transparent and easier to evaluate for sensitivities.
• No hidden triggers: If you are managing any food sensitivities — MCAS, allergies, intolerances — look for citric acid, "natural flavors," and anything the label cannot fully explain. Products with full ingredient transparency cost nothing to identify.
• Carbohydrate match to use case: Carbohydrate-containing drinks for efforts over 60–75 minutes or race settings. Plain electrolyte products for shorter training sessions where fuel is not the priority.
• Osmolality when it matters: For maximal fluid absorption speed, hypotonic formulations (lower solute concentration than blood) absorb more quickly than isotonic or hypertonic ones. This matters most when rapid rehydration is the primary goal.

The Label Is the Product

Every product decision you make going into training and racing is an ingredient decision. The marketing on the front of the bottle — "advanced hydration," "performance formula," "scientifically designed" — is not a substitute for reading the back. The numbers either map to your physiology or they don't.

This applies to every sports nutrition product, not just electrolyte drinks. And it applies whether you are a competitive athlete trying to optimize performance, someone managing a chronic condition that makes ingredient selection non-negotiable, or simply a person who thinks that what goes into your body ought to be something you can actually account for.

The science is not complicated. The sodium you need is not a secret. The only thing standing between most athletes and a better hydration strategy is taking the time to look at what is actually in the bottle — and comparing that to what the science says they need.

That is why we label everything we make the way we do. Not as a brand statement. As a baseline expectation that every product in the market should already be meeting. Stay Salty.