Many energy bars are safe during pregnancy, but some contain ingredients to avoid: caffeine, guarana, green tea extract, ginseng, or other herbal supplements. Always read labels. Bars made from nuts, oats, fruits, and protein powder are fine.
A "Use Caution" rating means this food is generally fine during pregnancy but comes with a specific factor worth managing — a daily limit, a preparation requirement, or a moderation guideline — rather than a reason to avoid it outright. These ratings reflect general guidance from the FDA, ACOG, CDC, and USDA. The goal of the "caution" label is to flag what to pay attention to, not to suggest the food is unsafe when that factor is properly managed.