The antioxidant effects of Rooibos

Compared to rats that received only tap water, those that received Rooibos tea had significantly less damage to their testicular tissue after researchers injected the area with a chemical oxidative stressor. Oxidative stress is a prominent cause of defective sperm.

Awoniyi et al., 2011. Protective effects of Rooibos (Aspalathus linearis), green tea (Camellia sinensis) and commercial supplements on testicular tissue of oxidative stress-induced rats. African Journal of Biotechnology, 10(75), pp. 17317-17322.
Available at: http://www.academicjournals.org/AJB/abstracts/abs2011/28Nov/Awoniyi et al.htm

A human study with 15 healthy volunteers proved for the first time that the antioxidants in Rooibos are potent enough to measurably elevate the antioxidant levels in blood, thereby boosting the body's internal defence systems against disease. The effect peaks about one hour after drinking 500 ml Rooibos tea.

Villaño et al., 2010. Unfermented and fermented Rooibos teas (Aspalathus linearis) increase plasma total antioxidant capacity in healthy humans. Food Chemistry, 123(3), pp. 679-683.
Available at: http://linkinghub.elsevier.com/retrieve/pii/S0308814610005923

A Japanese study showed that Rooibos could reduce inflammation in rats with colitis (open sores in the colon) via increased antioxidant activity with a consequent reduction in damage to DNA caused by oxidation. These researchers recommend Rooibos as a safe and useful way to reduce oxidative stress.

Baba et al., 2009. Studies of anti-inflammatory effects of Rooibos tea in rats. Pediatrics International, 51(5), pp. 700-4.
Available at: http://www.ncbi.nlm.nih.gov/pubmed/19419525