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L-Theanine and composure

L-theanine is an amino acid naturally present in tea. Human studies have investigated its effects on stress-related measures and cognitive tasks, including studies without caffeine.

In a small randomized crossover trial, 30 adults took 200 mg daily for four weeks. Researchers reported improvements in some measures after supplementation, but not every result showed a benefit over placebo.

This is early evidence, not proof of better putting, lower scores, or an effect lasting a full round. The study tested L-theanine rather than PACE18 Essentials.

Read the study: Hidese et al., 2019

Taurine and exercise research

Taurine has been studied as a supplement in exercise settings. One small crossover study tested 1,000 mg before a 3-kilometer running time trial in trained runners and reported faster performance than placebo.

That finding concerns a specific dose, activity, and group of athletes. It does not establish improved golf endurance, reduced back-nine fatigue, or better scores. This study did not test PACE18 Essentials.

Read the study: Balshaw et al., 2013

L-Tyrosine and mental demands

Researchers have investigated whether supplemental tyrosine can help people perform mentally demanding tasks. In one placebo-controlled study, tyrosine improved aspects of working-memory performance during a multitasking test.

A laboratory task is different from choosing a club, reading a green, or recovering after a difficult hole. The results do not establish that every dose improves focus or that Essentials produces the same effect.

Read the study: Thomas et al., 1999

Creatine beyond the weight room

Creatine participates in the body's energy system, and researchers have explored its role in cognitive performance as well as exercise.

An early trial in 45 young adult vegetarians used 5 grams daily for six weeks and reported improvements in working memory and reasoning. A larger later trial found much smaller potential effects, with uncertainty around the results.

These studies did not test PACE18 Essentials or golf performance.

Read the studies: Rae et al., 2003 and Sandkühler et al., 2023

Citicoline and attention

CDP-choline is another name for citicoline. In a randomized, placebo-controlled trial involving 60 women ages 40 to 60, researchers tested 250 mg or 500 mg daily for 28 days.

Participants taking citicoline made fewer errors on certain measures of a computerized attention test. The results varied by dose and measure, and the trial's population limits how broadly the findings can be applied.

Read the study: McGlade et al., 2012

The minerals behind hydration

Electrolytes help the body maintain fluid balance and support normal nerve and muscle function. Essentials includes sodium, potassium, and magnesium.

You lose electrolytes through sweat, and losses vary with the weather, activity, and the individual. Essentials should be used according to its label as part of your overall food and fluid intake.

Read the overview: NIH Office of Dietary Supplements, 2026