Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Taurine is a naturally occurring amino sulfonic acid that is found in many tissues of the human body and is commonly added to energy drinks and supplements. The rationale for its inclusion in energy formulations is based on its role in several physiological processes, such as bile salt formation, calcium signaling, osmoregulation, and antioxidation. Some small-scale studies have suggested that taurine supplementation may reduce fatigue and improve exercise performance, possibly by supporting cardiovascular function and muscle contractility. However, the evidence for its direct effect on subjective energy levels or fatigue in the general population is limited. Most clinical research is either conducted in conjunction with caffeine or other stimulants or is based on animal models, making it difficult to isolate the effects of taurine alone. Citric acid, on the other hand, is largely used as a flavoring and preservative agent in beverages and does not have any established role in energy metabolism beyond its biochemical presence in the citric acid (Krebs) cycle. There is no direct evidence that supplemental citric acid improves energy levels or reduces fatigue. Overall, while there is some scientific rationale and preliminary evidence for taurine’s inclusion in energy support products, the quality and scale of the evidence are modest, and the effect size is likely small. Evidence for citric acid as an energy support agent is not present. Thus, the scientific support for taurine (and not citric acid) in addressing lack of energy rates a 2 out of 5.

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