Effects of L-Cystine and L-Theanine Supplementation on the Common Cold: A Randomized, Double-Blind, and Placebo-Controlled Trial

Table 7

Adverse events during the 5-week trial period.

Adverse events (%)	Cystine/Theanine group (𝑛=88)	Placebo group (𝑛=85)	𝑃-value^a
Nausea	5 (5.7)	6 (7.1)	.764
Vomiting	1 (1.1)	4 (4.7)	.205
Abdominal pain	8 (9.1)	9 (10.6)	.802
Diarrhoea	13 (14.8)	13 (15.3)	1.000
Anorexia	4 (4.5)	8 (9.4)	.243
Chest pain	2 (2.3)	0 (0.0)	.497
Skin rash	0 (0.0)	0 (0.0)	—

aFisher’s exact test was used for comparisons between groups.