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Beta-alanine is one of the more evidence-supported ergogenic supplements, with a clear mechanistic rationale and a reasonable body of research behind it. We chose Thorne's sustained-release version specifically because the tingling that stops many people continuing with standard formulations is a real adherence barrier — and a supplement you stop taking doesn't work. Thorne's reputation for clean, consistent manufacturing made the choice straightforward.
About this product
Beta Alanine-SR
Thorne Beta Alanine-SR is a sustained-release beta-alanine supplement designed to support muscular endurance during high-intensity exercise. Beta-alanine is a non-essential amino acid that raises muscle carnosine levels. Carnosine acts as an intracellular buffer, helping to neutralise the acid build-up that accumulates during intense effort — the mechanism behind that familiar burning sensation that forces you to slow down or stop. Higher carnosine concentrations may allow you to sustain output for longer before fatigue sets in.
This is a supplement suited to athletes in disciplines where repeated bouts of high-intensity effort matter: interval training, cycling, rowing, team sports, and strength training with short rest periods. It is less relevant for purely aerobic, low-intensity work. The sustained-release format addresses a common drawback of standard beta-alanine: paraesthesia, the harmless but sometimes distracting tingling sensation in the skin that occurs when a large dose hits the bloodstream quickly. By spreading absorption over time, the SR tablet reduces that response, which makes consistent daily use more practical.
Thorne is a brand with a long-standing reputation for rigorous manufacturing standards and clean formulations. Their decision to use a sustained-release matrix here reflects a considered approach to tolerability — something our clinicians weigh when recommending a supplement that needs to be taken daily over weeks for carnosine levels to meaningfully rise.
What it does
Benefits
- 01
Raises muscle carnosine to buffer acid during intense effort
- 02
Sustained release reduces the tingling of standard beta-alanine
- 03
Suited to interval training, cycling, and high-intensity sport
- 04
Supports endurance in repeated bouts of near-maximal effort
- 05
Consistent daily use builds carnosine levels over time
Get the most from it
How to use
Take 2 tablets twice daily, as directed on the packaging. The sustained-release format means timing relative to training is flexible; consistent daily intake matters more than taking it immediately pre-workout. Taking tablets with a meal may further moderate absorption rate.
What's inside
Ingredients
View full ingredient list
Beta-Alanine (sustained release)
Common questions
Frequently asked
Why does beta-alanine cause a tingling sensation?
The tingling — called paraesthesia — is a benign neurological response to a rapid rise in beta-alanine in the bloodstream. It is harmless, but some people find it distracting enough to stop taking standard beta-alanine supplements. The sustained-release format in this product slows absorption and significantly reduces that effect.
How long before I notice a difference in performance?
Beta-alanine works by gradually raising muscle carnosine concentrations, which takes time. Most research suggests a meaningful increase builds over several weeks of consistent daily intake. It is not an acute, feel-it-today supplement — think of it more like creatine: the benefit comes from sustained loading.
Is this suitable for endurance sports like marathon running?
Beta-alanine is most relevant where the primary limitation is acid accumulation in the muscle — typically efforts lasting roughly one to ten minutes at high intensity. Its benefit in longer, lower-intensity aerobic events is less well supported, so it is a better fit for sports with repeated intense efforts than for steady-state endurance.
Who should avoid beta-alanine or check with a doctor first?
Beta-alanine is generally well tolerated in healthy adults. Those who are pregnant, breastfeeding, or managing a chronic health condition should consult a doctor before starting. If you are taking other pre-workout supplements, check for overlapping beta-alanine content to avoid unintentionally high total doses.
Does it need to be taken on training days only?
No — because the goal is to raise baseline muscle carnosine levels, daily intake on both training and rest days is important. Missing doses on rest days slows progress. Consistency over weeks matters more than timing around any individual session.
Doctor-guided care
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