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One of the safest oils for a breastfeeding mother to use is lavender (Lavandula angustifolia). Other oils that may be considered are geranium (Pelargonium graveolens), Roman chamomile (Chamaemelum nobile), and fennel (Foeniculum vulgare var. dulce).
Pregnant and nursing women should avoid borage seed oil. One review suggests that it should be contraindicated during pregnancy given the labor-inducing and teratogenic effects of prostaglandin E agonists. Due to the lack of science behind borage oil's effectiveness or safety, it's important to take caution when using borage oil supplements.