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L-Lysine is aCountry Life Country Life L-Lysine Advanced 1 KEY IMMUNE BOOSTING INGREDIENTS - Country Life L-Lysine w/ Vitamin D and Elderberry is chauk full of immune boosting ingFix-it L-Lysine Liquid for Cats | Immune & Wellbeing Support Drops | Helps Maintain Feline Respiratory Comfort, Eye Moisture & DAILY IMMUNE SUPPORT FOR CATS: Formulated with L-Lysine, an essential amino acid that supports your cat’s natural immuneHerpecin-L Herpecin L Lip Balm Stick, SPF 30 & Lysine, 0.1 Ounce Tube HERPECIN L LIP BALM: Herpecin L helps treat, protect and relieve cold sores, sun and fever blisters, and chapped lips. 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