RX VITAMINS MegaFlex Powder Joint Supplement for Cats & Dogs, 600-g jar - Chewy.com

Rx Vitamins MegaFlex Powder Joint Supplement for Cats & Dogs, 600-g jar

By Rx Vitamins
Rated 3.5 out of 5 stars
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$57.00Chewy Price
$62.00Chewy Price
$54.15Autoship Price
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About This Item


  • Features joint-supporting ingredients like MSM and sea cucumber.
  • Incorporates glucosamine sulfate which helps build healthy cartilage.
  • Suitable for both cats and dogs.
  • Formulated by a veterinarian.
  • Carries the National Animal Supplement Council Seal (NASC).

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Nutritional Information

Feeding Instructions


Questions & Answers

4 Customer Questions

How many grams are in one container?
Answer by ChewyAug 20, 2022
This supplement contains 600 grams in one container.

How many grams are in 1 scoop?
Answer by ChewyAug 15, 2022
A single scoop will contain approximately 7 grams.

Can I give this to my 6.5lb dog?
Answer by ChewyNov 27, 2020
This supplement is suitable for use in dogs and cats of all sizes.

What is the flavor? Does it go on dry or wet food and do cats like the taste?
Answer by ChewyFeb 26, 2020
This supplement doesn't have any added flavor but it might have a salmon taste due to the addition of sea cucumber. The Mega-Flex Powder can be added to your pet's wet or dry food.

ReviewsWrite a Review

Rated 3.5 out of 5 stars
4 Reviews
Would recommend to a friend

4 Customer Reviews

Rated 5 out of 5 stars
By megan9 on Aug 6, 2022

Works like a charm

Bought this for my 11 year old lab. She has hip and knee arthritis and was having a hard time moving around, even yelping at times when getting up. After just a few days of having this with her dinner she has improved drastically! We have been using it for a little over a month now and she is years younger. Even jumping, running and playing like she used to! 100% worth it!

Rated 1 out of 5 stars
By Sally on Oct 7, 2022

This product made ZERO difference; tried for 6 weeks

We hoped this product would provide some measure of improvement with our 11 year old Golden's arthritis, but it did absolutely nothing. Waste of money and time.

Rated 3 out of 5 stars
By bonbon on Jun 10, 2022

a good product, but beware of allergic content

So my cat always have been allergic to shellfish/shrimp and salmon since I found her on the street. She is quite picky with additives but for this one she enjoyed eating it when added to food. The only thing I did not know was that there was a shellfish content on the label, and she instantly got allergic reactions esp on the eyes. I couldn't find the reasons for days and here it was. I use rx vitamins other products and they're good

Rated 5 out of 5 stars
By 4felines on Feb 12, 2020

Finally Found Loose Powder Instead of Pills

I have 4 cats and trying to open the pills to pour on their food was so time-consuming and aggravating. 3 of my cats are senior cats and need this for a better quality of life. So very THANKFUL Chewy carries this!