SodiumChloride
Hydration, energy, mental clarity
verified reviews
premium hydration built for intense lifestyles
supports fasting, energy, focus, and life at full speed.
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MADE IN EUROPE
TOP-TIER HYDRATION
NO SUGAR
NO CALORIES
BOOSTS FOCUS
INCREASES ENERGY
MADE IN EUROPE
TOP-TIER HYDRATION
NO SUGAR
NO CALORIES
BOOSTS FOCUS
INCREASES ENERGY
MADE IN EUROPE
TOP-TIER HYDRATION
NO SUGAR
NO CALORIES
BOOSTS FOCUS
INCREASES ENERGY
MADE IN EUROPE
TOP-TIER HYDRATION
NO SUGAR
NO CALORIES
BOOSTS FOCUS
INCREASES ENERGY
sharpen your edge
In a world designed to keep you soft, average and distracted, chasing your full potential is your competitive edge. FAST makes it sharper.
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DEEPER FOCUS
Stay sharp and get things done throughout your fasting window
INCREASED ENERGY
Boost energy levels while fasting, without sugar or calories
ACCELERATED FAT LOSS
Take fasting's natural fat-burning power to the next level
PRESERVED MUSCLE MASS
Don’t sacrifice your gains with glycine’s ability to protect against muscle loss
ENHANCED LONGEVITY
Support your body's natural cellular repair and renewal processes during fasting
WHY FAST?
highly concentrated
FAST delivers 2–3x more minerals per serving than most hydration brands. These are the minerals your body actually uses to hydrate, recover and perform at its best.
Less Water Needed
FAST requires only 400 ml of water compared to the usual 800 ml – 1 L. This keeps mineral levels where they need to be for true hydration, and makes it quick and easy to take anytime.
Zero Calories, Zero Sugar
Clinical studies show glycine supplementation can accelerates fat loss by 14% during caloric restriction. FAST helps support your body's natural fat-burning rhythm, especially during fasting.
The Glycine Advantage
FAST is the only hydration brand with glycine, a compound that helps calm the body and mind. Perfect for entrepreneurs, athletes, and anyone living life at full intensity where stress, training, and overstimulation are part of the daily routine.
*Based on average mineral content of leading electrolyte and energy drink brands, 2024.
setting higher standards
Alternatives often miss key ingredients, overload with sugar or calories, and simply underdeliver where it counts. FAST is built to create a new standard in hydration.
No Calories
No Sugar
Tastes good
Top-Tier Hydration
Sodium
hydration and electrolyte balance
700mg
Potassium
muscle and nerve functions
600mg
Magnesium
energy production and muscle function
150mg
Glycine
fat loss and muscle preservation
3,000mg
Electrolyte Drinks
Energy Drinks
Water + Salt
Water Alone
150-450mg
0-100mg
~200mg
0-5mg
50-150mg
0-85mg
0-1mg
0-1mg
0-50mg
0-10mg
0-10mg
0-10mg
0mg
0mg
0mg
0mg
MagnesiumSulfate
Focus, energy levels, mineral balance, recovery
PotassiumChloride
Muscle function, prevents cramping, hydration
Glycine
Boosts fat loss, helps preserve muscle mass during calorie restriction
Owner @fastr
"I’ve always been anti-supplement. Until I tried FAST."
As someone who’s been in the health space for the last 4 years, i’ve always been anti-supplement… That was, until I tried FAST. This is the only product that noticeably makes me feel sharper, sleep better, and enjoy more of life.
Professional Kitesurfer
"FAST keeps me sharp and hydrated"
As a professional athlete, taking care of my body isn’t optional, it’s part of the job. I use fasting regularly to reset my system and improve how my body works. FAST makes a huge difference during fasting, it keeps me sharp and hydrated and ensures I don’t lose muscle in the process.
Founder
“fasting has been a CRUCIAL part of my journey”
Whether it’s about staying lean, mentally sharp or hungry to go after my goals, intermittent fasting has been a crucial part of my journey. FAST helps me multiply the success that comes with it and eliminating the common side effects.
8-Figure Founder
“fast helps me stay sharp and make things happen”
As a business owner, I perform at my best when I fast during the first part of the day. FAST quickly became essential in my routine to stay sharp and make things happen. It also helped me reduce my coffee consumption and improve my mood and energy
Hybrid Athlete
“FAST changed the game for me”
As someone who travels and trains often, staying properly hydrated used to be a challenge. FAST changed the game for me. One sachet and a glass of water gives me everything I need without the calories, sugar and artificial ingredients of regular sports drinks.
THE POWER OF GLYCINE
Studies have shown supplementing glycine during a fast accelerates fat loss and protects against muscle loss*. This is why glycine is a major component of the FAST formula
Percentage (%)
0%
5%
10%
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25%
frequently asked questions
How do I take FAST?
Mix one sachet with 200-300ml of water based on your taste preference. Shake or stir until fully dissolved and drink. Thanks to glycine's naturally sweet prole and our minimal use of flavoring, FAST requires way less water than typical hydration products while maintaining a pleasant taste.
When’s the best time to take FAST?
FAST can be taken any time during your fasting window. Many users find it most beneficial in the morning or during periods of increased mental or physical activity. It can also be used whenever optimal hydration is needed, whether you’re fasting or not.
Does FAST break a fast?
No, FAST was specially designed to not break a fast. It contains zero calories and zero sugar, while delivering essential minerals and glycine to optimize your fasting experience
Is FAST also effective during non-fasting periods?
Yes. While designed for fasting, FAST's concentrated mineral formula makes it ideal for any situation requiring premium hydration. The benefits of optimal mineral and electrolytes balance extend far beyond fasting
Why is glycine a key component of FAST?
Beyond its natural sweetness that allows us to create a great taste without sugar, glycine is backed by clinical studies showing remarkable benefits during fasting: 27% less muscle loss and 14% accelerated fat loss. While commonly known as a sleep supplement, glycine's advantages extend throughout active hours, supporting energy production and metabolic health.
What makes FAST better than other formulas on the market?
Unlike typical hydration products that are over-flavored, loaded with sugar, and under-dosed in minerals, FAST delivers a highly concentrated mineral formula with zero calories. We focus on what matters: optimal mineral ratios in convenient sachets. No unnecessary ingredients, no excessive water intake, no artificial sweeteners—just pure effectiveness.
How much FAST can I take per day?
The recommended serving is 1 sachet per day, during fasting windows or periods requiring enhanced hydration.
Where do you ship from?
Your order will be shipped from our US or EU warehouse, based on your location.