HYK Endurance Formula was designed around a different concept: combining hydration, energy, focus, and recovery into one purpose-built endurance formula.

HYK provides 800mg of sodium, 450mg of potassium, 60mg of magnesium, 6g of cane sugar, 100mg of caffeine from green tea extract, 150mg of L-theanine, 250mg of L-tyrosine, 200mg of Alpha-GPC, and 1g of taurine.

LMNT's standard formula provides 1,000mg sodium, 200mg potassium, 60mg magnesium, and zero sugar. Standard Liquid I.V. Hydration Multiplier provides 500mg sodium, 370mg potassium, and 11g of sugar.

The key distinction is the architecture of the formula. HYK Endurance Formula isn't simply an electrolyte mix with caffeine added. It is built as a four-part endurance system: Hydration. Energy. Focus. Recovery.

Most hydration products are built primarily around replacing electrolytes and fluids. HYK Endurance Formula takes a broader approach by combining four distinct performance layers in one stick.

Instead of piecing together electrolytes, caffeine, and other performance products, HYK puts those components into one purpose-built endurance formula.

Endurance performance is influenced by more than hydration alone. HYK Endurance Formula is designed to address several demands of long-duration exercise at the same time.

The electrolyte system provides sodium, potassium, and magnesium to support fluid balance and normal muscle function. Caffeine provides a well-studied stimulant that can support alertness, attention, and exercise performance. Research on caffeine during exercise has found potential benefits for energy, mood, attention, and aspects of cognitive performance.

The focus system adds L-theanine, L-tyrosine, and Alpha-GPC, while taurine completes the formula's recovery-support component.

The goal isn't to make one ingredient do everything. It's to build a formula where each component has a specific role within the overall endurance system.

HYK Endurance Formula is designed for longer, harder training sessions and race-day efforts where you want hydration plus energy, focus, and recovery support.

A common approach is to begin drinking it before or near the start of your session and continue using it throughout the effort. Starting with hydration before you are significantly behind can help you establish your strategy before the demands of the effort accumulate.

For shorter or lower-demand sessions where you simply want electrolyte replenishment, HYK Essential Electrolytes may be the better fit.

Individual hydration and caffeine needs vary, so use your training sessions to determine what timing and intake work best for you.

HYK Endurance Formula can be used before and during demanding training or racing.

Taking it before the effort allows the caffeine and other performance ingredients to be present as the session begins, while using it during the effort helps maintain your hydration strategy as the miles accumulate.

For race day, test your timing and tolerance during training first. Your race-day hydration strategy should never be the first time you try a new product.

HYK Endurance Formula is intended for use when your training or racing demands more than basic hydration. It can be incorporated into demanding training sessions, long runs, endurance events, and race-day efforts.

Because each stick contains 100mg of caffeine, your total daily caffeine intake from all sources should be considered when deciding how often to use it.

Individual caffeine tolerance varies. If you are sensitive to caffeine, start conservatively and assess your response during training before using it during competition.

Yes. Each stick contains 100mg of caffeine from green tea extract.

Caffeine is included to provide the formula's energy component and support alertness and attention during demanding efforts. Research supports caffeine's potential effects on attention and aspects of cognitive and exercise performance.

HYK Endurance Formula also contains 150mg of L-theanine. Research on L-theanine has found potential short-term effects on attention, although the size and consistency of effects can vary between studies.

Alpha-GPC, or alpha-glycerophosphocholine, is a source of choline. Choline is used by the body to produce acetylcholine, a neurotransmitter involved in attention, memory, and communication between nerve cells.

For endurance athletes, focus can become increasingly important as an effort gets longer. Navigation, pacing, decision-making, maintaining form, staying mentally engaged, and managing discomfort all require attention.

HYK includes 200mg of Alpha-GPC as part of its broader focus system, alongside L-theanine and L-tyrosine.

Alpha-GPC is included as a focus-support ingredient; it should not be interpreted as a guarantee of improved athletic performance.

The HYK Focus System combines three complementary ingredients: L-theanine, L-tyrosine, and Alpha-GPC.

Together, they form the focus component of the Endurance Formula, designed to complement the 100mg caffeine dose during demanding training and racing.

Mix one HYK Endurance Formula stick with approximately 16–24 ounces of water.

Use less water for a more concentrated flavor or more water for a lighter taste. During long efforts, your overall fluid intake should be adjusted to the conditions, duration, intensity, and your individual hydration needs.

Yes. HYK Endurance Formula was specifically designed for the demands of longer endurance efforts.

The formula combines a high-sodium electrolyte system with caffeine, focus-support ingredients, and taurine in one stick, making it a purpose-built option for long training sessions, ultras, trail races, and other demanding endurance events.

For very long events, HYK Endurance Formula should be considered part of a broader fueling and hydration strategy rather than a replacement for adequate food or carbohydrate intake.

Each stick contains:

The result is a four-part endurance system built around Hydration, Energy, Focus, and Recovery.