【醫生信箱】Q27. L-theanine/PS 有無用?

Q27. 想問我小朋友食 L-theanine for 少啲緊張，放鬆情緒，PS for 提升專注力，但想知每日份量&最高可接受份量？

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L-茶氨酸（L-Theanine）是一種天然存在於茶葉（尤其是綠茶）中的氨基酸，已知具有放鬆、抗焦慮和改善認知功能的作用。對於兒童的潛在益處，目前的研究有限。

關於 L-Theanine 研究(2011)﹕有機會對ADHD 學童有改善睡眠作用

https://pubmed.ncbi.nlm.nih.gov/22214254/

PS (phosphatidylserine) 有相對多少少研究

https://pmc.ncbi.nlm.nih.gov/articles/PMC9208377/

呢篇係一篇 review article，將相關既研究 combine 嚟 review

咁有四個重點

• "Children with ADHD have lower levels of phosphatidylserine in serum, as well as the basal ganglia and prefrontal cortex."

• "Results of the meta-analysis showed a statistically significant effect of 200–300 mg/day of phosphatidylserine on symptoms of inattention relative to placebo" (對專注力不足有機會有幫助)

• The effects of phosphatidylserine on overall symptoms of ADHD (ES 0.76; 95% CI: −0.07 to 1.60; p = 0.07) and hyperactivity-impulsivity (ES 0.24; 95% CI: −0.04 to 0.53; p = 0.09) were not statistically significant (整體講又可能無太大幫助，尤其是過動/衝動既行為問題)

• additional research in this area is warranted (須要進一步研究) ✍🏻撰文：精神科專科醫生 張正平醫生