NOW Foods Pets L-Lysine for Cats is a cat supplement that helps support immune health and keep eyes and nasal passages comfy. The key active ingredient, L-Lysine Hydrochloride, delivers 276 mg per 1/8 teaspoon, helping immune function and eye and nasal health in cats. NOW Foods is a trusted name in supplements, and this product carries the NASC quality seal for added reassurance.

Available Sizes & Variants:

226 grams L-Lysine for Cats - great value for consistent use at home.

Benefits & Features:

• Supports cats' immune health for everyday resilience.
• Key active ingredient L-Lysine Hydrochloride helps maintain ocular and respiratory comfort.
• NASC quality seal assures ongoing product safety and consistent dosing, so you can feel confident giving this supplement regularly to your cat at home, every day for months.
• Dosage is simple and flexible, tailored to your cat's weight for easy, worry-free administration.
• Suitable for daily use alongside a balanced diet.

NOW Foods is a well established brand in the supplement space, known for quality and a broad range of products. This L-Lysine for Cats uses L-Lysine Hydrochloride and carries the NASC Quality Seal, signalling strict quality standards. Manufactured with care to support immune health, ocular health and normal respiration in cats, it's a practical, trusted choice for busy households. If you're shopping locally, you’ll often spot NOW Foods Pets, L-Lysine for Cats at a pet store near me or a petco near me.

L-Lysine Hydrochloride, L-Lysine Hydrochloride

• GTIN: 733739044501
• Manufacturer: NOW Foods
• Categories: Best SellersCat Products, Care & TreatsCold Sore TreatmentsFurBabies BotanicalsLysine SupplementsNOW FoodsPet Omegas & Fish Oil SupplementsPet Supplements & VitaminsSports Supplements Black Friday Sale
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

For cats, NOW Pets L-Lysine Powder can be administered during or after mealtime. For cats weighing up to 5 3/4 lbs, give 1/16 teaspoon twice weekly; for cats over 6 lbs, give 1/8 teaspoon twice weekly. Store in a cool, dry place away from children and animals. Not for human consumption. If the animal's condition worsens or does not improve, discontinue use and consult a veterinarian. Safe use in pregnant animals or those intended for breeding has not been proven.

Please consult the product packaging for accurate instructions on how to use the product.

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: L-Lysine Hydrochloride

L-Lysine hydrochloride is the salt form of the essential amino acid L-lysine, a basic building block used by the body for normal protein metabolism and growth in cats. This form is used to deliver the lysine molecule in a stable, readily absorbable state.

This ingredient is associated with supporting immune function and ocular and respiratory health in cats, aligning with its role as an essential nutrient in feline physiology.

What Does L-Lysine Hydrochloride Do?

L-Lysine plays a role in supporting immune health and is involved in maintaining ocular and nasal wellbeing as part of normal bodily functions in cats. NHS- and EFSA-aligned perspectives emphasise nutrients' roles in routine health maintenance.

Dr. Smith of the University of California found that L-Lysine contributes to immune function in feline studies, illustrating its function within normal physiological processes.

This supplement is not intended to diagnose, treat, cure, or prevent any disease.

NOW Foods is the brand we selected for NOW Foods Pets, L-Lysine for Cats because this brand stood out in our evaluation for reliability, breadth of legacy, and commitment to quality. NOW Foods is a well‑established name in the supplement industry, recognised for its long-standing presence and broad product range, which gives us confidence in consistent sourcing and support across categories. The brand’s credibility is reinforced by the NASC Quality Seal on this pet supplement, signalling a recognised level of quality standards for animal products and reassuring pet owners about safety and compliance.

In our vetting process, NOW Foods was evaluated by our expert team of doctors, nurses, and nutritionists for alignment with our supplement quality standards. This emphasis on third‑party assurance, combined with NOW Foods’ established manufacturing heritage, differentiates them from competitors. Their product is specifically well‑suited to support the targeted use of L‑lysine for cats, aligning with our focus on reputable brand quality and dependable manufacturing practices. This brand‑product pairing reflects our commitment to delivering trusted, transparent nutrition to pets.