---
product_id: 12370753
title: "THOMAS LAB Fel-O-Lysine Powder, 3-Pound"
brand: "brand: thomas lab"
price: "R$939"
currency: BRL
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.br/products/12370753-thomas-lab-fel-o-lysine-powder-3-pound
store_origin: BR
region: Brazil
---

# THOMAS LAB Fel-O-Lysine Powder, 3-Pound

**Brand:** brand: thomas lab
**Price:** R$939
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** THOMAS LAB Fel-O-Lysine Powder, 3-Pound by brand: thomas lab
- **How much does it cost?** R$939 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/12370753-thomas-lab-fel-o-lysine-powder-3-pound)

## Best For

- brand: thomas lab enthusiasts

## Why This Product

- Trusted brand: thomas lab brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Thomas Labs Fel-O-Lysine Powder is a L-Lysine supplement in powder form for cats used as an aid in the treatment of feline herpes virus.

## Features

- All Natural!
- Supports immune system function, collagen formation, tissue repair, antioxidant activity and antibody lymphocyte production
- Treats feline herpes virus and associated respiratory and ocular symptoms and as a general L-Lysine supplement

## Images

![THOMAS LAB Fel-O-Lysine Powder, 3-Pound - Image 1](https://images-na.ssl-images-amazon.com/images/I/91Agb3pZMHL.jpg)
![THOMAS LAB Fel-O-Lysine Powder, 3-Pound - Image 2](https://images-na.ssl-images-amazon.com/images/I/41oNJKSJW7L.jpg)
![THOMAS LAB Fel-O-Lysine Powder, 3-Pound - Image 3](https://images-na.ssl-images-amazon.com/images/I/61SqMZ0PrzL.jpg)

## Customer Reviews

### ⭐⭐ 







  
  
    Waste of money
  

*by K***. on Reviewed in the United States on May 15, 2016*

I can only presume this is a very weak form of lysine. With this product you have to use a teaspoon of product for a dose of lysine. The product I was buying before only used 1/8-1/4 teaspoon per dose. Getting cats to eat so much powder with dry food is impossible, where as the other got eaten. I will not be purchasing this again. Not worth it at all.

### ⭐⭐⭐⭐⭐ 







  
  
    Kitties love the chews
  

*by K***E on Reviewed in the United States on October 13, 2016*

So much more economical that buying lysine chews.  Kitties love the chews, but I can mix powder in some soft food and kitties devour. I can get them to take more lysine using the powder.  Got my kitties from a rescuer and they use this since so many kitties they rescue from shelters have URI.  Lasts a long time so if saving $ is your motivation, this is way to go

### ⭐⭐⭐⭐⭐ 







  
  
    It Works!
  

*by G***M on Reviewed in the United States on January 6, 2015*

Since I started adding this to my cat's water bowls I have noticed a significant reduction in the sneezing and occasional runny noses that they had.It appears to be a very good product and I would not hesitate to make further purchase.

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**Shop now:** [https://www.desertcart.com.br/products/12370753-thomas-lab-fel-o-lysine-powder-3-pound](https://www.desertcart.com.br/products/12370753-thomas-lab-fel-o-lysine-powder-3-pound)

---

*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-25*