Lansinoh Lanolin Nipple Cream
One ingredient, ultra-purified lanolin, and you don't wash it off before the next feed. The tube in almost every hospital bag, because it works and nothing about it needs thinking through at 4am.

If latching hurts, this glides on smoothly for soothing relief and protection, and you do not need to wipe it off before the next feeding, which matters when you are nursing every couple hours.
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Sore nipples from latching, especially in the early weeks
It is lanolin-based, so if you are looking for a lanolin-free option this is not it, but the ingredient list is short: lanolin, caprylic/capric triglycerides, and oat beta glucan.
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