Well while you're looking for substitutes to energy drinks, keep in mind that whatever has Ginkgo, or Caffeine is definitely a NO NO for her. This being said, my safest recommendation to you is natural sources of starch and sugar like fruits, and natural juices, supplements with Taurine can also help as it is a natural stimulant needed by the body. All these things make up an energy drink but what makes them bad for your wife are caffeine and Ginkgo.
Caffeine is a vaso-dilator and substantially increases blood pressure, but Ginkgo is known to be bad for pregnancies either we just don't know why yet. She can eat apples, drink orange juice and things like that, just look at the nutrition labels to make sure it's safe for her. Hope this helped.
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