Taurine is an amino sulfonic acid that is naturally present in the body and is especially concentrated in the heart. There is a moderate amount of scientific evidence supporting taurine’s beneficial effects on heart function, particularly in cases of heart failure and general cardiac weakness. Several clinical studies and animal experiments have demonstrated that taurine supplementation can improve cardiac contractility, reduce symptoms of heart failure, and potentially lower blood pressure. The mechanisms are thought to involve membrane stabilization, modulation of intracellular calcium levels, and antioxidant effects, which together help improve myocardial function and reduce cardiac stress. The Japanese Circulation Society has even listed taurine as a supplementary treatment for heart failure in some clinical guidelines. However, the evidence is not universally strong, as many studies are small or lack rigorous placebo controls.

Citric acid, on the other hand, is not recognized as a direct therapeutic agent for heart weakness or heart failure. It is primarily used as a flavoring, preservative, or pH adjuster in supplements, and does not have any known effects on cardiac function. Therefore, any benefit for heart weakness is attributable to taurine, not citric acid.

In summary, taurine shows moderate but not definitive scientific support for adjunctive use in heart weakness, while citric acid plays no physiologic role in cardiac support.