Instant Hydration vs Re-Lyte: Which Electrolyte Powder Fits You?

Choosing between Instant Hydration and Re-Lyte comes down less to which mix has “more electrolytes” and more to which formula matches your needs. Instant Hydration provides less sodium and more potassium, magnesium, and calcium than flavored Re-Lyte. Re-Lyte delivers more sodium—and its unflavored formula contains more still.

Here’s how the labels compare, what the differences mean, and how to choose without getting distracted by broad “hydration” claims.

Instant Hydration vs. Re-Lyte at a glance

Per serving	Instant Hydration	Re-Lyte, flavored	Re-Lyte, unflavored
Sodium	500 mg	810 mg	1,000 mg
Potassium	470 mg	400 mg	500 mg
Magnesium	100 mg	50 mg	60 mg
Calcium	170 mg	60 mg	Not listed
Calories	10	0	0
Sugar	0 g	No added sugar; check flavor label	0 g

Instant Hydration’s product page lists 500 mg sodium, 470 mg potassium, 100 mg magnesium, and 170 mg calcium per serving. Its ingredients include Sel Gris, magnesium bisglycinate, potassium chloride, and calcium from mineralized algae; the powder is sweetened with stevia and monk fruit.

Redmond’s published figures for Re-Lyte are different by formula: flavored Re-Lyte has 810 mg sodium, 400 mg potassium, 50 mg magnesium, and 60 mg calcium, while unflavored Re-Lyte has 1,000 mg sodium, 500 mg potassium, and 60 mg magnesium, with no calcium listed. Don’t assume the flavored and unflavored versions are interchangeable when comparing labels.

The biggest difference: sodium

Sodium is the clearest point of difference. A serving of flavored Re-Lyte has 310 mg more sodium than Instant Hydration; unflavored Re-Lyte has 500 mg more. That may matter to people who are comparing sodium intake or choosing a mix for longer, sweatier exercise—but a higher amount is not automatically a better fit for everyone.

How much fluid and sodium a person needs can depend on factors such as workout duration, heat, and individual sweat losses. Mayo Clinic advises drinking to thirst during exercise, with electrolyte beverages potentially useful when you’re sweating and replacing fluid losses. For routine, lower-intensity activity, a specialized drink mix may not be necessary.

Potassium, magnesium, and calcium

Instant Hydration has more potassium, magnesium, and calcium per serving than flavored Re-Lyte. Its formula also includes magnesium bisglycinate. Re-Lyte’s ingredient list includes Redmond Real Salt, potassium citrate, magnesium glycinate, and magnesium malate; the brand describes its formula as a dual-magnesium blend.

These differences help explain why the products appeal to different label preferences. If you’re comparing formulas, check the amounts of each mineral—not just the “electrolyte blend” total or the number of ingredients.

Sugar, calories, ingredients, and mixing

Both products are positioned as no-added-sugar options. Instant Hydration lists zero sugar and 10 calories per serving, while Re-Lyte lists zero calories and no added sugar. Flavored Re-Lyte contains a small amount of coconut water powder, so check the current nutrition panel for the flavor you’re buying if you’re tracking every gram of carbohydrate or sugar.

Instant Hydration’s published directions say to mix a stick into 16–24 ounces of cold water. Re-Lyte’s directions recommend mixing a serving with 16–18 ounces. Follow the directions on your specific package, since product formats and labels can change.

Which one should you choose?

Instant Hydration may fit better if you want a zero-sugar powder with more potassium, magnesium, and calcium than flavored Re-Lyte, and less sodium per serving.

Flavored Re-Lyte may fit better if you want more sodium per serving and prefer its salt-forward electrolyte profile. Unflavored Re-Lyte is a separate comparison: it has more sodium and potassium than the flavored formula, so check the label before choosing.

Neither label can tell you what your personal electrolyte needs are. If you have a health condition, follow a medically directed diet, or have been told to limit sodium, ask a qualified healthcare professional before making a hydration mix part of your routine.

The bottom line

In a direct Instant Hydration vs. Re-Lyte comparison, Instant Hydration is the lower-sodium option with more magnesium and calcium, while flavored Re-Lyte delivers more sodium. Re-Lyte’s unflavored version changes the comparison again, with 1,000 mg of sodium per serving. Compare the exact flavor and label you plan to use—and choose based on your preferences and activity, not the biggest number on the package.