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Manna Pro (#10086)


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    Cups:    ( Cups / Meal)
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Feeding Chart

Daily Serving

Dog Weight - lbs Inactive Dog Active Dog Working Dog
Inactive Dog - Less than 30 minutes of vigorous exercise daily
Active Dog - At least 30 minutes of vigorous exercise daily
Working Dog - More than two hours of vigorous exercise daily
This is only a guide. Please consult your veterinarian to determine the perfect feeding amount for your dog.
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Product Overview

Supports joint health & mobility

Corta-Flx is a joint supplement that contains key isolates of chondroitin sulfate and glucosamine in proper molecular size, assuring passage through cell walls. Corta-Flx is now available in the convenience of an easy-to-administer pellet.

Available in pellets in SmartPaks or as a liquid in bottles.
  • Chondroitin sulfate & glucosamine in the right molecular sizing to assure passage through cell walls

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Key Ingredients


Supplement Facts

Ingredient Name Amount Per Serving
Ingredient Name Amount Per Pound

Ingredient Details


Weight Recommended Amount Loading Amount

How the Ingredients Work


Supporting Success

Supercharge Your Supplements

  • Simplify with SmartPaks | Consistent, Custom, Convenient
    We take the guesswork out of serving sizes, ensuring your horse gets the right amount, every time. SmartPaks have airtight seals to ensure that your horse always has the freshest supplements available. Your horse is unique and his supplements should be too. Choose from over 230 supplements to get everything he needs, nothing he doesn't. We print your horse's name on every Pak so there are no mix-ups, making feeding time fast, accurate and easy! Unlike most buckets, SmartPaks are made from recycled plastic and can be recycled again! We'll send your SmartPaks on time so you never run out, with total flexibility and no commitment. Plus all SmartPaks over $40 receive free ground shipping.


The reviews provided on this website represent the experience of the individual posting the review. We do not adopt, edit, or endorse any of the submissions posted within the reviews section. Rather, the reviews are part of an online community of animal owners that desire to share their particular experience with other individuals. These reviews are not a substitute for discussing the health of your animal with a veterinarian.

SmartPak customers are some of the most conscientious animal owners around. We encourage you to share your experience with the products we sell to help fellow customers to make informed choices for their animals. We do not edit these reviews in any way - they are direct customer-to-customer communication. We do monitor reviews for positive and negative feedback, and use this feedback to improve our selection as well as sharing feedback with product manufacturers to help them improve their products. Please note that we recommend consulting your vet with serious health issues.

Corta-Flx® is rated 4.5 out of 5 by 71.
Rated 5 out of 5 by from Used for ringbone I started my draftXqh mare on this a month ago to improve movement. She has almost fused ringbone and I haven't had to give her any bute in three days! (She was on 2 scps/day with 12hr t/o) I started the other four horses on it as well I'm so impressed!
Date published: 2015-09-06
Rated 5 out of 5 by from
Date published: 2015-07-14
Rated 5 out of 5 by from Amazing! I started my horse on CortaFlex about two months ago and I have seen an amazing improvement in his joints and movement! I love it!
Date published: 2015-06-02
Rated 3 out of 5 by from not much improvement Horse has osteoarthritis -supplement did not appear to improve condition much.
Date published: 2015-01-13
Rated 5 out of 5 by from Easy to use Very happy with my decision to switch to SmartPak. Convenient, easy to use and I am confident that my horse is getting the supplements. I have since added a probiotic product to our SmartPak order.
Date published: 2015-01-09
Rated 3 out of 5 by from I used this and Bute at same time and they helped I used this for two months along with Bute and the combination seems to help. I only gave 3 stars because I'm not sure if it was the Bute or the Corta-flex or if it was the combination that helped.
Date published: 2014-10-18
Rated 4 out of 5 by from It works! Have tried other products for 23 yr old with some success but this seems to have had a faster and more noticeable effect. She's less stiff and sound in front again. still some creaky hocks but she had a hard life prior to coming to us at age 12.
Date published: 2014-10-16
Rated 5 out of 5 by from Always geeat I've seen positive changes since poppa's been taking these!
Date published: 2014-08-18
Rated 3 out of 5 by from Prefer the liquid over the pellets. See result on liquid.
Date published: 2014-07-23
Rated 5 out of 5 by from inexpensive I have had my horse on this for a few years. Keeps her moving.
Date published: 2014-02-21
Rated 3 out of 5 by from Cotta Flex I bought this in June per my vet.  My horse is 26 and has soreness and joint issues.  I have since retired him and put him on Corta Flex.  It has seemingly improved his movement and comfort.  But I'm starting to think my horse is no longer responding to this product, we may switch to something else.  I have found this situation to be true in two other horses- a friends horse and one of my others.  All in all I thinks it's a good product but you may need to switch to something else every so often...
Date published: 2013-11-25
Rated 5 out of 5 by from Locking stifle solution. I have an 8 year old Haflinger gelding who has weak stifles and after having been on stall rest after an extended illness, his stifles started locking on him. After reading the reviews for this product, I thought I would give it a try. I started seeing results after 2 weeks and even though he is still on light duty, I haven't seen the stifles lock once. My barn owner is very impressed with the results she has seen as well. Will definitely be adding this supplement to his feed on a regular basis. Dry or liquid form, he cleans up every last bit. Glad I found this.
Date published: 2013-08-31
Rated 5 out of 5 by from Great Purchase I started this product to help my mare before resorting to injections. After two months, no need for injections! 6 months later and she is still moving great. I’m relieved!
Date published: 2012-11-01
Rated 5 out of 5 by from Great Product Have noticed a difference in my horse since starting him on corta-Flx pellets. He can be a picky eater, but he never leaves this in his feed tub. Love Smart Paks for their convenience, too!
Date published: 2012-07-05
Rated 5 out of 5 by from Corta-Flx Pellets I started giving this product to my young horse to ensure many years of competitive success down the road by protecting his joint health now. He doesn't receive that much grain and loves this product almost more than his grain!
Date published: 2012-02-11
Rated 4 out of 5 by from Best Value Like other reviewers, I was also hesitant to try different supplements due to financial reasons. I had used Corta-flx with great results years ago before there were a million other supplements to choose from, as it was vet recommended. Like other reviewers I figured it was outdated compared to newer items on the market, but I could afford it so gave it a try. I am so glad I did. I foxhunt, hunter-pace and trailride my mares. Not only is my mare that was stiff feeling unbelievably more comfortable with improved gaits and improved attitude - but also their coats are really glowing more than when they were just on their Purina feed alone.
Date published: 2011-10-11
Rated 5 out of 5 by from Nice :) I switched from the corta flx pellets to this and it's been great! You get alot more for your money with the liquid...i think! It's lasted me longer :) and my pony's doing gret!!
Date published: 2011-10-03
Rated 5 out of 5 by from I keep coming back to this one I started using this product over 10 years ago when it first came out. I have tried other products, and I keep coming back to this one. It works. I do have to discontiue it a week or so before endurance rides because it contains MSM (a big no-no for endurance competitions) but that is easy to do because I can just cut the Smart Pak well off and save it to double up after the ride.
Date published: 2011-09-20
Rated 5 out of 5 by from all-around standby Corta-Flx is a good buy suitable for horses young and old. I supplement with Focus SR for my 24-yerar-old thoroughbred, and it is a good combination that I feel works better than the Corta-Flx Senior supplement.
Date published: 2011-08-30
Rated 5 out of 5 by from Keeps them going! I use this on 2 horses. One older stiff mare and a huge thoroughbred as a preventative. It works wonders on the older mare! It also worked very quickly , i saw results within the first week on the loading dose. She now moves with ease. Seems to be keeping the big guys joints happy and moving free.
Date published: 2011-08-17
Rated 5 out of 5 by from Works like a charm My Clyde gelding was on a flex supplement when I bought him this spring. The first time the farrier was out he could barely hold up his hind legs for the farrier and we had to lower the hoof stand and give him breaks. I was hesitant to try different supps for financial reasons, but had used Corta Flx on an old mare of mine that I had 12 years ago. I had figured that if his current supplement didn't work with all of the new technology available then Corta Flx must be outdated and probably wouldn't be any better than what he was on. Not to mention it is one of the cheaper supplements on the market. I was wrong!! The next time the farrier was out my gelding stood very comfortably for his hind feet to be trimmed! I will always use Corta Flx!!
Date published: 2011-07-13
Rated 5 out of 5 by from Can't move without it! Put both my horses on this and noticed a BIG difference in their movement. Both where not stiff anymore. One of my boys is 19 and the other is 25. Both started to move amazingly. I tried switching to a cheaper supplement to save money and they became stiff again. My 25 year old wouldn't run in the pasture anymore. Never again will i take my horses off of CortaFlex. Nothing will compare!
Date published: 2011-06-29
Rated 4 out of 5 by from Picky Horse Loves It! My horse can be a little picky when it comes to supplements. I have the liquid form of CortaFlx because I was told that it is absorbed better.....(questionable...). But with CortaFlx, she will eat it, even without grain (it even smells yummy). I am not sure if it is actually doing anything, because I am using it mostly as a maintenance because my horse is only 5, however she has a small amount of arthritis in her hocks. We keep her on Adequan as well. I am thinking about trying the pellets next time because the liquid is messy.
Date published: 2011-06-23
Rated 4 out of 5 by from Tasty stuff My boy who's a very picky eater, seems to enjoy this on his grain every day. I haven't noticed a difference in the creakiness of his joints yet, however. It's only been a few weeks, but I'll continue to give this to him.
Date published: 2011-05-26
Rated 5 out of 5 by from LOVE this product! This is the only joint supplement I have found to make a serious difference in my horse in a very short amount of time. Without Corta-Flx, he comes out of his stall very stiff in the morning. After starting him on Corta-Flx, 3 days into the loading dose he walks out like a champ. He will now gallop in the pasture with his friends and keep up with them - and he is 21! The pelleted form is very palatable - each horse taking this supplement will eat it right out of the hand.
Date published: 2011-05-21
Rated 5 out of 5 by from Year Long, Lots of Progress Well, when I first bought my mare she started coming up lame. So she was seen by multiple vets, one being a lameness specialist. She was put on injections, and feed through. Corta Flx is the best feed through supplement out there. She's been sound and moving so fluidly since she's been on this supplement. It definitely gives her the extra boost she needs. It's inexpensive, palatable, and works great!
Date published: 2011-03-22
Rated 5 out of 5 by from Good for picky eaters I use this on my TB who has mild arthritis in her hocks. I have noticed a significant difference after having her on this product. She's been on it for 4+ months, with Adequan and MSM. The combination works amazing for her. I was feeding the pelleted, but it is cheaper to feed the liquid. :)
Date published: 2010-11-07
Rated 5 out of 5 by from Love This Product I have been a Cortaflex user for years on multiple horses. I have tried another brand that was supposed to be the same but the results stated otherwise!! My horses make faster, smoother, and more consistant runs when on Cortafelx. I just switched from the liquid to pellets. This makes life on the road much easier and not so messy in the horses clean it up!!
Date published: 2010-09-01
Rated 5 out of 5 by from Great Product - Recommended! I have been using this product on my retired A-curcuit H/J and my off-the-track TB in training and it is awesome! It does take a month or so to kick-in and see results but the results ARE noticable when it does! My vet recommended this to me for use on my guys from the retired Appendix to my now in training TB. It has worked great for the damage that has been done from the 5 ft fences & the prevention of future damage to my TB in training. I think the cost is good too considering some other products.
Date published: 2010-08-11
Rated 5 out of 5 by from Maintanece Only Purchase I am using this product for a 3 yr old futurity hopefull barrel horse. It is being used as a maintanece only product so far, so not change has been seen since we started this product, but no change was expected either. Will continue to use as it seems to be a good product for the money.
Date published: 2010-08-09
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