Product Description
You know that burn in your legs at the end of a hard interval — the one that makes you back off the pace right when it matters most? That's acid buildup in your muscles, and most athletes just accept it as a ceiling on how hard they can push. Here's what the pros figured out a long time ago: you can raise that ceiling with the right amino acid.
Thorne Beta-Alanine SR is the go-to supplement for athletes who want to go harder, longer — especially in the efforts that hurt most.
Targets the Burn at Its Source Beta-alanine is the amino acid your body uses to produce carnosine — a compound stored in muscle that neutralizes the acid buildup that causes that deep, heavy fatigue. More carnosine means more time before your muscles hit the wall.
Sustained-Release Delivery via PureTab® Technology Standard beta-alanine can cause an intense (and harmless) skin-tingling sensation when taken in effective doses. Thorne's PureTab® sustained-release system delivers beta-alanine gradually, keeping blood levels steady, maximizing absorption, and minimizing the tingle — without sacrificing effectiveness.
NSF Certified for Sport Every batch is tested for banned substances and label compliance. If you race or compete, this is non-negotiable.
Beta-alanine is what your body uses to produce carnosine — a natural acid buffer stored in muscle tissue that keeps fatigue at bay during hard efforts. Research shows the biggest gains in anaerobic efforts lasting 1–4 minutes and aerobic efforts longer than 4 minutes. Carnosine levels run lower in women, vegetarians, and older athletes, so those groups often see the most pronounced benefit.
How to Use Thorne Beta Alanine-SR
Daily dose: Take 2 tablets once or twice daily, with or without food.
Consistency is the key: Beta-alanine works by building carnosine levels over time — effects compound over several weeks of regular use, not overnight.
Pro tip: If you notice any mild skin tingling, it's harmless. The SR format significantly reduces this, but splitting your dose (morning and afternoon) minimizes it further.
Thorne is the supplement partner of choice for over 100 professional sports teams and is the most recommended clinical supplement brand by healthcare practitioners. Beta-Alanine SR uses the same SR CarnoSyn® form studied in clinical trials showing performance improvements in cyclists, rowers, and sprint athletes.
Stop leaving performance on the table at the end of your hardest efforts — Thorne Beta-Alanine SR is the clinically-backed, NSF-certified tool that lets you push deeper into the red without hitting the wall.
- Gluten free
- Sport Tested: NSF Certified for Sport®
Supplement Facts
60 Servings
Serving Size: 2 Capsules
Serving Per Container: 60
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Beta-Alanine 1.6g | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
Thorne Beta Alanine-SR FAQ's
Everything you need to know before getting started.
Beta-alanine is an amino acid your body uses to produce carnosine, which is stored in your muscles and acts as a buffer against the acid buildup that causes fatigue during hard efforts. Higher carnosine levels mean you can sustain intensity longer before your muscles force you to back off.
Beta-alanine works by gradually elevating carnosine levels in your muscles over time. Most athletes notice meaningful improvements after 3–4 weeks of consistent daily use, with effects continuing to build over several months.
The tingling (called paresthesia) is a harmless, well-known side effect of beta-alanine that occurs when blood levels rise quickly. Thorne's PureTab® sustained-release system delivers beta-alanine gradually, which significantly reduces or eliminates this sensation compared to standard beta-alanine supplements.
Take 2 tablets once or twice daily, with or without food. Splitting your dose (morning and afternoon) is a good strategy if you're sensitive to the mild tingling some users experience. It's a daily supplement — consistency over weeks matters more than timing around workouts.