Among the strategies that can improve the body's ability to counteract oxidative stress, the use of nutritional antioxidants has been investigated. Taurine is a "semi-essential" amino acid, also called a nitrogen compound, which has been used as an effective antioxidant due to its ability to neutralize hypochlorous acid, an extremely toxic oxidant produced by leukocytes in the inflammatory process in humans.

Objective: To evaluate the oxidative parameters of women aged 55 to 70 years after 16 weeks of taurine supplementation.

Methods: Twenty-four women age 55 to 70 will be randomly assigned to two groups: control group (GC), supplemented with placebo (1.5 g of starch); and taurine group (GTAU), supplemented with taurine (1.5 g), for 16 weeks. Anthropometry, functional capacity test, taurine, and levels of oxidative stress markers will be determined in pre and post intervention plasma samples. Food consumption will be assessed before, during, and after the intervention. The results will be analyzed by an ANOVA two-way repeated measures mixed model, with the Sidak post hoc (p < 0.05).

Inclusion Criteria:

• Had being aged 55-70 years;
• Female;
• Post-menopausal;
• Sedentary (not practicing physical exercise for at least 6 months).

Exclusion Criteria:

• Chronic kidney diseases;
• Infectious contagious diseases;
• Coronary heart disease;
• Smokers
• Alcoholics.

Supplement capsule packages were labeled as "Supplement A" and "Supplement B" and the nutrient (taurine or placebo- starch) was revealed after the end of the intervention.