The Rein Blog
Training, supplementation, and recovery — broken down without the bro-science. Real, evidence-based guidance to help you get more out of every session and train for the long game.
What Does Agmatine Sulfate Do in a Pre-Workout? An Honest Look (2026)
Agmatine is the most name-dropped and least explained line on a pre-workout label. Here’s what 1.5g may do, and where the research runs out.
Betaine Anhydrous: What 3g Actually Does for Power Output (2026)
Most pre-workouts skip betaine or dust it. Here's what 3,000 mg actually does for force output, work capacity, and why the dose has to be real.
Beta-Alanine and the Tingles: What 4g Actually Does (2026)
That tingle after your pre-workout is beta-alanine — and it's harmless. Here's what 4g actually does, why it works over weeks, and how to dose it.
Why 10g of L-Citrulline Is the Pump Standard (And Why 6g Isn't Enough) in 2026
Most pre-workouts under-dose citrulline. Here's why 10g of pure L-Citrulline is the real clinical standard for pumps — and how to spot the label tricks.
How Much L-Citrulline Do You Need for a Real Pump? (2026)
Most pre-workouts under-dose citrulline. Here's how much L-citrulline you actually need for a real pump — and why the form and dose both matter.
