Table 2. Results of consuming antioxidant consumption on semen parameters in the related literature.

Author(s)	Sample size	Target population	Antioxidant	Consumption	Length of consumption	Result(s)
Elsheikh et al. (2015) [20]	90	Oligo-asthenospermia	Vitamin E (400 mg) + clomifene citrate (25 mg)	Daily	6 months	Increased sperm concentration (p = 0.001)
Safarinezhad (2009) [21]	212	Oligozoospermia Asthenospermia	Q10 (300 mg)	Daily	26 weeks	Increased sperm concentration and total motility (p = 0.001)
Nouri et al. (2007) [22]	60	Asthenozoospermia	Vitamin E (400 mg) + vitamin C (1000 mg)	Daily	2 months	Except for increased sperm total motility (p ≤ 0.05), no Significant effect on other parameters
Keskes-Ammar et al. (2003) [23]	72	Infertile male	Vitamin E (400 mg)+selenium (225 mg)	Daily	3 months	Increased sperm total motility and concentration (p ≤ 0.05) and no significant effect on semen morphology (p ≥ 0.05)
Kodama et al. (1997) [11]	14	Infertile male	Vitamin E (20 mg) + vitamin C (200 mg) + glutathione (400 mg)	Daily	2 months	Increased sperm count (p ≤ 0.05)
Suleiman et al. (1996) [24]	52	asthenozoospermia	Infused vitamin E (100 mg)	3 times a day	6 months	Increased motility (p ≤0.05)