Same you. Just fastr.

A lime-flavored bicarb drink designed to buffer lactic acid, so you can run harder for longer - without the burn.

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GUT FRIENDLY

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TASTES GREAT

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DELAYS FATIGUE

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99-Day Money-Back Guarantee

Rated 4.6/5 from 200+ reviews

Clinically proven in 12-week trial • 97% of users report zero gut issues • Science-backed ingredients • Improved endurance or your money back •
Clinically proven in 12-week trial • 97% of users report zero gut issues • Science-backed ingredients • Improved endurance or your money back •

4 Performance Ingredients, 1 Advanced Formula

CLINICALLY PROVEN & EFFECTIVE

Sodium Bicarbonate

The gold-standard lactic acid buffer. Boosts endurance and delays the burn during high-intensity efforts.

10,000 mg

Sodium Citrate

Work synergistically with bicarb to improve stamina by buffering lactate and optimising pH levels.

8,000 mg

Glucose

Rapid-acting fuel that enhances muscle glycogen, providing the immediate ATP needed for strong finishes.

10,000 mg

Citric Acid

Balances flavour, improves drinkability, and provides that signature fastr lime taste.

1,000 mg

Pro Runners. Sub-Elites. Amateurs.

They all drink fastr.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Took 45 seconds off my 5K PB. The difference in the last kilometre is unreal — my legs just didn't burn out like they usually do. This stuff actually works.

Tulahati H.

Actually tastes like a normal lime drink, not salty bicarb. I genuinely look forward to drinking it before a run. Night and day compared to what I tried before.

Sophie R.

I've tried bicarb loading before but it destroyed my stomach. ZoneX? Zero issues. Ran a half marathon with no GI distress at all. Game changer for me.

Mark D.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

Just rip, pour, shake, go. So much easier than measuring out baking soda on race morning. Tastes great and I can feel the difference in my interval sessions.

Lucy K.

Less than $3 a sachet for something that actually works? I was spending 10x more on disgusting gel that did nothing for the burn. Brilliant value.

James P.

Used it for all my track sessions now as well as races. My training partner couldn't believe it the first session! Already pre-ordered more.

Freddie F.

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  • MORE PACE, LESS PAIN

    Go faster for longer with our revolutionary buffer mix; scientifically formulated to delay the lactic burn, without any stomach distress.

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  • SAFE, CONVENIENT, AFFORDABLE

    Manufactured in a GMP-certified, FDA-registered facility and formulated without any banned substances. Get the safe, easy route to fastr runs.

    Trust What's Inside