A homeopathic nasal gel, made by Zicam and containing ionic zinc gluconate, was recalled by the US FDA in 2009 because it has been associated with long lasting or permanent loss of smell (anosmia) [this is not related to lactation - see the FDA information page and Jafek BW, Linschoten MR, Murrow BW. Anosmia after intranasal zinc gluconate use. Am J Rhinol. 2004 May-Jun;18(3):137-41]. Zicam contains small amounts of zinc (Zincum Gluconicum) – 266 micrograms per squirt; in one study (Mossad 2003) the daily dosage used was 2.1 mg per day. Zinc is considered compatible with breastfeeding, particularly in small amounts (excessive amounts are not a good idea, for mom’s sake rather than baby’s). The amount of systemic absorption of nasal sprays/gels is minimal compared to oral ingestion.
Emergen-c? DH swears by zicam, but I don't know if the lozenges are safe. Also any kind of rapid dissolve zinc pill is usually effective for me if I stick with it.