The authors pooled 15 studies covering 360 people who took beta-alanine or a placebo and then completed exercise tests. Beta-alanine produced a median improvement of about 2.85% in the exercise measures, with the gain showing up in efforts lasting one to four minutes and in exercise capacity tests rather than performance tests. Efforts shorter than 60 seconds showed no benefit, and there was no relationship between the dose taken and the size of the effect.
Beta-alanine is the building block for carnosine, a compound stored in muscle that soaks up the hydrogen ions produced during hard exercise. Those ions make muscle more acidic, which is one cause of fatigue. Narrative reviews existed, but nobody had pooled the numbers. This was the first meta-analysis on the topic, and it asked which kinds of exercise, and which durations, the effect applies to.
The authors searched PubMed, SPORTDiscus and Google Scholar in July 2011, plus reference lists. Three researchers judged each paper against fixed criteria, majority ruling on disputes.
For each measure they calculated an effect size, the before-and-after change divided by the pooled standard deviation, corrected for small samples. The data were not normally distributed, so comparisons used Mann-Whitney U tests and results are medians.
Across all 57 measures, beta-alanine had a median effect size of 0.374 (interquartile range 0.140 to 0.747) against 0.108 (-0.019 to 0.487) for placebo, P = 0.002. That is a median improvement of 2.85 percent, range -0.37 to 10.49 percent, at a median total dose of 179 g.
The effect was uneven:
Dose showed no relationship with the size of the effect (P = 0.337).
Individual studies were small, averaging 12 people per group, and the authors say some may have been underpowered. Only 12 performance measures existed in total, and only one fell in the 60 to 240 second window where the effect is strongest. The participants were narrow: 77.2 percent were young, healthy, active males, 20.3 percent were female and 7.2 percent were elderly. Only 3 of 15 studies included women and only 1 included older people, and all of those used tests lasting over 240 seconds. Beta-alanine causes paraesthesia, a tingling of the skin, which can tell participants they are on the active supplement and break blinding. Eight of the 15 studies were given the supplement by a commercial company and five acknowledged financial support from one. Four do not say where their beta-alanine came from, and most did not test its purity. The authors note the risk of publication bias, and that a meta-analysis cannot weight studies by methodological quality. One author's listed affiliation is Junipa Ltd, a company; the paper declares no conflict of interest.
The useful part of this analysis is the split, not the headline. The pooled 2.85 percent sits on a pattern: an effect in exhaustion tests and in efforts of roughly one to four minutes, and no measurable effect in fixed-endpoint tests or in efforts under a minute. Because dose showed no relationship with effect, the analysis cannot say how much is needed. It is 2012 evidence in young active men, so it does not carry over to women, older people or clinical groups, and the authors say so directly.
That depends on the specific medication and formula. A few, like blood thinners with CurQLife or blood pressure medication with MaxiNOs, are worth a direct conversation with your doctor first. Check each formula's own FAQ section for specifics, or ask your health coach.
No, and we'd rather be upfront about it. Bacopa, the plant in BacoZest, has published human studies, though they used other bacopa extracts. OptiNOs and MaxiNOs each have human studies sponsored by their maker, Laila Nutraceuticals, which haven't been published in a journal. CurQLife's research is still early, from lab and animal studies, and we label it that way.
It depends on what you're building your routine around. BacoZest is built around bacopa, which is studied for memory.* OptiNOs supports strength and muscular endurance alongside resistance training.* MaxiNOs was studied for healthy blood vessel function.* CurQLife's research is still at the lab stage. Your health coach can help you pick a starting point.
All four are built around plant extracts. OptiNOs was reported as well tolerated in its human study, and published bacopa studies reported no serious side effects. CurQLife's safety data so far comes from lab and animal testing. Check with your doctor first if you're pregnant, nursing, on medication, or managing a health condition.
Because the patented ingredients behind our four formulas went through dedicated research, and research costs real money. A generic curcumin or bacopa supplement hasn't been tested in the form you get from us. You're paying for an ingredient with research behind it, not just a label.
Generic ingredients often haven't been studied in the specific form you're buying. Our four core formulas use patented ingredients, and we show you the research behind each one, including where it's still early.
It depends on the formula. In its study, MaxiNOs blood vessel response was higher than placebo 2 to 3 hours after the first dose.* OptiNOs and bacopa were studied over 6 and 12 weeks of daily use, so give them time. CurQLife is meant to be taken daily.
Yes. BacoZest, OptiNOs, MaxiNOs, and CurQLife are built for different goals, and none of them contain stimulants. They haven't been studied together, so ask your health coach how to fit them into your routine.
