29 June 2012
According to a new Iranian study, vitamin C and E supplements may protect against increased oxidative stress in women taking oral contraceptives.
In the randomized controlled trial that lasted four weeks, 120 healthy women were divided into three groups: those taking contraceptives only (0.03 mg ethinylestradiol and 0.15 mg levonorgestrel), those taking contra-ceptives plus vitamin C and E supplements (150mg and 200 IU respectively), and those taking a placebo (1). An analysis of blood samples showed that participants who only took contraceptives experienced increased levels of a marker of oxidative stress (malondialdehyde), while antioxidant enzyme activity (glutathione peroxidase and glutathione reductase) decreased. Taking additional supplements of vitamins C and E significantly increased enzyme activity and reduced plasma levels of the oxidative stress marker.
The researchers commented that low-dose oral contraceptives may potentially present a cardiovascular risk by enhancing oxidative stress and lipid peroxidation. The use of vitamins E and C may therefore be bene-ficial in reducing this side effect of oral contraceptives. However, larger intervention studies would be necessary to confirm these results.
9 December 2011
People who eat fish on a weekly basis may be both improving their brain health and reducing their risk of developing mild cognitive impairment and Alzheimer's disease, according to a new US study.
25 October 2009
Increased intakes of omega-3 fatty acids may reduce the risk of developing age-related blindness by 30 per cent, reports a new study.
Vitamin D insufficiency in early adulthood may be a risk factor in subsequent hypertension among women, a new US study suggests.
