PURE RELIEF: Natrum Carbonicum is a homeopathic medicine that relieves post nasal drip or headache due to sun exposure.* A BETTER WAY TO FEEL BETTER: This medicine has no known interactions with other medications, herbs, or supplements; no contraindications; and does not contain artificial colors, flavors, sweeteners, or preservatives EASY TO TAKE: Pellets melt under the tongue, no food or water needed and great for on the go A TRUSTED BRAND: With more than 90 years of expertise, Boiron medicines are made to meet the highest standards of cGMP and HPUS for purity and quality HSA & FSA eligible: Boiron homeopathic medicines are HSA & FSA eligible.