N-Acetyl-L-Cysteine, a precursor of the antioxidant glutathione, promotes lung health and may assist in improving general well-being in people with mild functional lung problems (Respir Med 1994 Aug;88(7):531-5).

Vitamins C and E, carotene, riboflavin, and selenium are an antioxidant team that assists the regeneration of reduced glutathione, and exerts other antioxidant effects. Antioxidant protection against oxidative stress is critical for pulmonary health (Pharmacol Res 1999 Nov; 40(5):393-404).

Horehound and licorice extracts, and thyme oil, are traditional pectorals - lung tonics - and expectorants (Culpeper’s Herbal).

Six capsules provide:
Horehound (Marrubium vulgare)* 1,500 mg
N-Acetyl-L-Cysteine 600 mg
Vitamin C (ascorbic acid) 500 mg
Licorice Root (Glycyrrhiza glabra)** 200 mg
Thyme Oil (Thymus vulgaris)*** 200 mg
Natural Vitamin E (d-alpha-tocopheryl acetate) 200 IU
Natural Beta-carotene 600 IU
Vitamin B2 (riboflavin) 10 mg
Selenium (L-selenomethionine) 50 mcg
* 4:1 concentrated extract
** standardized to 20% glycyrrhizin
*** standardized to 20% thymol content
Other ingredient: vegetable stearine