L-Lysine USP Powder

4oz, 8oz, 1lb, 2lb & 5lb resealable bags.

*Need more than 20 lb's? Contact Us directly for a quote.



  • 1 lb
  • Limited Availability
  • Ships within 1-2 days1



L-Lysine is one of the nine essential amino acids and one of the 22 proteinogenic amino acids. It cannot be produced by the human body and must be consumed in its entirety within the diet.


Lysine plays a particularly important role in the immune system as it is involved in the development of antibodies and has important antiviral properties, and has been shown to decrease occurrences of anxiety as well as assisting in the formation of collagen and muscle tissue.


An L-Lysine deficiency may therefore result in broken skin, fragile nails and in extreme cases loss of hair, and studies show that L-Lysine is especially beneficial for safeguarding against the herpes virus. 


Lysine for cats is also a common use as it helps defend against and overcome difficulties with FHV-1 (the feline herpes virus).


• Gluten-Free • Non-GMO • Vegan •

Nutritional Information


Additional Information

•Dietary Supplement

•Ingredients: 100% pure, pharmaceutical-grade L-Lysine.

•Store in a cool, dry location away from direct sunlight.

•Serving Suggestion: 1/4 teaspoon (500 milligrams) per day.


*These statements have not been evaluated by the FDA.

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


Warning: Consult your physician before use.

Keep out of reach of children.

Lysine is an important building block of protein.

• Customer Reviews •

⭐️⭐️⭐️⭐️⭐️ Also good for cats!

August 28, 2018

Give it to all my cats. It definitely helps the two that need it. Cheaper then the one with flavoring for cats and they don't seem to mind.

-Robert S.


⭐️⭐️⭐️⭐️⭐️ it's for the next time I get shingles

July 17, 2018

next time I have shingles, i'l have it ready to take in my kitchen

-Barb B.


⭐️⭐️⭐️⭐️⭐️ Good quality product

May 10, 2018

I use this powder for my cats to help with sneezing and runny noses (caused by feline herpes virus). I used to buy a product from the vet that could be fed directly to the cats but since I have multiple cats using L-Lysine the cost was prohibitive. When I found this bulk powder, it did require a little math to calculate the correct dosage (about 1/8 teaspoon). I mix it with canned cat food and they don't even notice. This 1 lb bag costs slightly more than a can of the product from the vet and lasts for months, whereas the can from the vet only lasted about 3 weeks. It is just as effective as the veterinary product and really helps with the sneezing and runny noses. This is a good quality product and the company always sends a follow-up email asking if there were any problems.



⭐️⭐️⭐️⭐️⭐️ The best!

February 28, 2018

I have ordered this several times but this was the best order yet. it was really smooth and silky.

-Jenny L.


⭐️⭐️⭐️⭐️⭐️ Very fine powder

November 23, 2017

Very fine powder. The least bitter tasting too.

-Darcy S.


⭐️⭐️⭐️⭐️⭐️ Five stars

May 24, 2017

Exactly what I expected.

-William A.


⭐️⭐️⭐️⭐️⭐️ Perfect for me and the cats!

May 8, 2017

Bought for my cats who refuse to take their vitamins...was so happy to see it was powdery instead of granular as it mixes so much better with their food...I even use it in my morning green drink!

-Emily V.


⭐️⭐️⭐️⭐️⭐️ Fantastic

February 17, 2016

Love the quality. Easy to mix in milk or blends, tasteless.



⭐️⭐️⭐️⭐️⭐️ Awesome product

December 2, 2015

This is awesome. I take 2 grams of this and vitamin C powder two to three times per day and it is working miracles healing this 62 year old body.

-Larry C.


⭐️⭐️⭐️⭐️⭐️ Works as advertised!

November 20, 2015

I bought a combination of supplements and they are working great together. I have a noticeable improvement in my hips and knee joints, very little pain now. Thanks for the help!

-Debbie C.