correct mint is not good for BFing, the halls fruit breezers don't have menthol in them and taste pretty good though - robetussin (plain) is safe, as is plain mucinex (guaifenesin, nothing added) - decongestants, including sudafed (and benadryl, but thats not decongestant) run significant risk of drying milk supply.
on ginseng, from kellymom.com:
Ginseng (Panax ginseng)
Panax Ginseng is not considered a "safe" substance for long-term use in lactating women. Ginseng may cause estrogenic side effects as well as platelet changes. The most common form is the American root called Panax quinquefolium L. (this is an endangered species). There is also an Asian variety (panax ginseng), also called Korean or Chinese ginseng. These two varieties are practically identical. No data are available concerning transfer into human milk. According to Hale, no pediatric concerns have been reported but caution is urged. Also known as white ginseng, red ginseng, panax, minimycin, and red kooga. Possible side effects include tachycardia and hypertension. A Review of 12 Commonly Used Medicinal Herbs (O'Hara et al) says, "We do not recommend ginseng use for pregnant or lactating women or for children until safety and efficacy are proven in randomized controlled trials." More on Is Ginseng Safe for Nursing Mothers? and ginseng in general.
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Siberian Ginseng (Eleutherosides, Eleuthero root)
Little is known regarding eleutherosides and breastfeeding. Until more information is available, some suggest that Siberian ginseng should be avoided during nursing (more here). Others indicate that siberian ginseng is safe for nursing mothers: see Is Ginseng Safe for Nursing Mothers? by Dee Negron.