The intervention dosages ranged from 3.2 to 6.4 grams per day and were often taken in smaller servings (0.8 grams, 4–8 times per day), over durations of 4 to 10 weeks. The cumulative doses ranged from 134 to 448 grams.

Strength was assessed using various methods, and the most common was the 1-repetition maximum (1RM) for exercises like the squat and bench press.

Out of the 9 studies, 1 study reported improvements in 1RM and power, another study reported improvements in 1RM, and 2 studies reported improvements in endurance-related strength measures (holding 45% of quadriceps maximal voluntary isometric contraction until exhaustion and flexed-arm hang). The other 5 studies reported no statistically significant benefit from beta-alanine.

The risk of bias was high in two studies, unclear in 4 studies, and low in 3 studies.

Beta-alanine for strength and power? Original paper