The most common ingredients in energy drinks are caffeine, taurine, Guarana, B vitamins, ginseng, Gingko Biloba, L-Carnitine, sugar, antioxidants, yerba mate, creatine, Glucuronolactone and milk thistle, most of which are considered potentially harmful during pregnancy. Some of these ingredients are considered safe in moderation during pregnancy, but most are considered potentially harmful or have no conclusive studies.
A safe ingredient is sugar. Sugar can be consumed during pregnancy in moderation with no ill effects on the pregnant woman or fetus as long as Type I, Type II or gestational diabetes is not present. B vitamins are also considered safe during pregnancy and can be found in over-the-counter prenatal vitamins. Antioxidants such as Vitamin C and Vitamin E are not only safe during pregnancy but are a crucial part of free radical repair before, during and after pregnancy. The remaining common energy drink ingredients are not considered safe during pregnancy.
Caffeine and Guarana (a fancy name for caffeine) are of particular concern. Caffeine can increase the risk of miscarriage with only 100 mg consumed per day. Energy drinks can have as much as 200 mg of caffeine per serving. The risk of miscarriage increases proportionately with the amount of caffeine consumed.
The remaining ingredients are holistic and alternative. There are very few clinical studies on holistic ingredients and even fewer studies on the effect of ingredients like taurine, milk thistle and Glucuronolactone on the fetus. Most herbal ingredients are included in energy drinks to assist the metabolism of fat into energy, increase energy production in the body, or boost natural amino acids.
There is no proof energy drinks work to increase energy through any function other than through the supply of caffeine to the body. Fatigue is a part of pregnancy. The body undergoes substantial changes that increase the need for sleep. Fatigue most often effects pregnant women during the first month of pregnancy and the last month of pregnancy and will subside.