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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).
In general, it appears that it is safe for breastfeeding mothers to consume xylitol (a natural sugar substitute). In fact, there is some evidence that maternal use of xylitol products can help prevent dental cavities in children.