> Supplements > Digestive > Item # SLT901026

Manna Pro Opti-Zyme

Regularly: $22.21
Today's savings: 10%

Sometimes, manufacturers require that products be advertised only at their suggested prices. When we choose to sell these items for less, we display the sale price only in the cart. To see the price, click Add to Cart.

Manna Pro Opti-Zyme


In Stock. Usually Ships within 24 hours.

Shipping weight = 3.25 lbs.


Product Summary:

Manna Pro® Opti-Zyme®

Manna Pro® Opti-Zyme® probiotic supplement is made with naturally viable yeast, enzymes and beneficial bacteria to promote optimal digestion. This easy-to-feed meal formula is highly palatable and can be top dressed with your horse's feed.


  • Natural probiotic ingredients help promote optimal digestion
  • Easy to feed
  • Use in horses, cattle, pigs, sheep, and goats
Item Specifications:

Daily Dosage:
2 oz. per 1,000 lb. of body weight

3 lb. (up to 24 days supply)

Guaranteed Anaylsis:
Saccharomyces: 158 x 109 CFU/lb
Enterococcus Faecium: 0.79 x 109 CFU/lb
Lactobacillus Casei: 0.31 x 109 CFU/lb
Lactobacillus Plantarum: 158 x 109 CFU/lb
Amylase*: 17,875 BAU/lb
Protease*: 18,750 CDU/lb
Hemicellulase*: 1,585 HCU/lb
Betaglucanase*: 11,440 BGU/lb
*Source of Naturally Occuring Viable Yeast, Enzymes and Bacteria For Use in Animal Feeds

Yeast culture, saccharomyces cervisiae, dried enterococcus faecium fermentation product, dried lactobacillus casei, dried lactobacillus acidophilus fermentation product, dried lactobacillus plantarum, dried bacillus subtilis fermentation product, dried aspergillus oryzae fermentation extract.

Feeding Directions
Top dress at the following levels:
Horse: 1-2 oz./head/day
Beef & Dairy Cattle: 1-2 oz./head/day
Swine: 0.25-0.50 oz./head/day
Sheep: 0.25-0.50 oz./head/day
Goats: 0.25-0.50 oz./head/day

For those who mix their own feed:
Opti-Zyme® can be added to the grain mix at the rate of 10 to 15 lb/T.

PLEASE NOTE: Date on package is manufacture date, not an expiration.

For Product Label Information, please click on Manufacturer Information to the right.

Downloadable Resources
Product LabelManufacturer Information
Item Number Model Number UPC
SLT901026 1000082 095668994921
Additional Information:
Legal Disclaimer - This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to

Product Reviews by Customers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 6 questions Browse 6 questions and 72 answers
Why did you choose this? Store
to prevent gas in my 2 older horses
Anne B on Mar 21, 2019
Both of my horses have had issues with colic before since starting Opti-Zyme both have not had colic issues.
Mary C on Jan 11, 2019
to prevent gas in my 2 older horses
Anne B on Mar 21, 2019
great for my older horses. Vet approves of this as a supplement for them.
Roseann B on Mar 6, 2019
Both of my horses have had issues with colic before since starting Opti-Zyme both have not had colic issues.
Mary C on Jan 11, 2019
great product well priced
Roseann B on Jan 4, 2019
Have been using this product for almost 1 year now. Works great!
Kasey R on Dec 29, 2018
I have been using it for my horse for years. Easy to add to grain and reasonably priced.
T I on Dec 6, 2018
my horse gets beet pulp and alfalfa - the extra water he gets from soaking these can make his stool a little loose - this firms everything back up.
Kelly G on Dec 4, 2018
The BEST ever !!!
Susan C on Nov 23, 2018
The price
Devin W on Oct 22, 2018
Love this product. Very comparable to Smart Pack SmartDigest at a fraction of the price. My horse does not qualify for the colicare smart pack program so no sense paying the extra money for smart digest. I have a PhD in Animal Science and I highly recommend this product.
CARA W on Oct 5, 2018
Helps the digestion of my older horse - she is 29.
Stephanie F on Sep 17, 2018
My horse is 29 and Opti-Zyme has made a big difference in her ability to digest food.
Stephanie F on Sep 5, 2018
Have used this off and on for years. Good to keep on hand should your horse experience a stomach upset.
Claudia J on Jul 25, 2018
I have used this for a couple of years. My mare is 22 years old and I was having a hard time keeping weight on her for a while even though she was eating the proper amount of food. I tried weight builder supplements which did some good. Once I started with the Opti-Zyme she had no more problems. Eating the same amount - no weight supplement - doing great. Coat looks so much healthier and she is feeling fine!
Teresa P on Jul 23, 2018
Because my horse is so sensitive to environmental irritants, I do all I can to boos his immune system.
Leah F on Jul 15, 2018
have used for about five years after my mare had a slight gas colic. Keeps digestive system healthy
Mary C on Jun 2, 2018
easy to give to horses, good ingredients
Roseann B on May 29, 2018
trial for my stallwalking mare
Lani W on Mar 26, 2018
One horse has a history of gastric ulcers. Opti-Zyme is an instrumental part of his prevention program and the price is right.
Jean T on Mar 10, 2018
My 21 yr old low thyroid, IR, laminitis sensitive gelding began chronic diarrhea a year ago . . . tried everything under the sun - tons and tons of SandRid (which he hates). Having run out of options, figured I take probiotics so why not the horse . . .Finally he has some relief! Been feeding Opti-Zyme for a couple months, and he is nearly diarrhea free!! Highly recommend this product - oh yeah, and he LOVES it!!
Brenda F on Feb 28, 2018
is really great for horses that have loose stool often like my older gelding when stressed from changed environment or feed.
Allicia C on Feb 20, 2018
I have two seniors that receive this twice a day. I believe it keeps them on track.
Rosemarie D on Dec 12, 2017
Using it as a preventative for ulcers in addition to aloe and alfalfa.
Brandie T on May 26, 2017
a friend of mine said her vet recomended this for all horses over 20,, ive been giving to all my senior group for several years and they look and act great, 2 mares are 26. they love the flavor.. my only complaint, it needs to come in larger quantity sizes...i recomend this product.
sharon k on Nov 27, 2016
Vet suggested to improve my horses itchy skin and to prevent any digestive issues due to training stress.
Gail M on Sep 1, 2016
This Item works wonderful for hay belly. It helped my rescues gain weight
Amber B on Aug 15, 2016
Great for balancing digestion. Especially helpful to resolve diarrhea.
Mary C on Aug 7, 2016
A great digestive aid for a reasonable price and is comparable to higher priced products.
Lynn K on May 13, 2016
Great price - excellent results with my ageing horses
Elsie W on Mar 1, 2016
Over 80 percent of your immune system is in your gut. Need your immune system for good health. Any time an animal is stressed or their health is compromised, feed their gut.
John C on Jun 5, 2015
We're out of it.
Dennis J on May 9, 2015
Works just as well as FastTrack at half the price. :)
Lisa M on Mar 26, 2015
I am having a tough time keeping weight on a senior horse. A friend suggested a probiotic with yeast to help with nutrient absorption.
Jennifer S on Jan 17, 2015
My horse had loose stools for years. I have tried many probiotics for years and finally this one makes his stool normal which he has never had before. It is truly amazing and he will eat it too easily.
Starr S on Nov 3, 2014
good price compared to local supplier
Doreen J on Jun 23, 2014
VIRGINIA S on Feb 25, 2014
to increase the percentage of food that is digested.
CHERYL C on Jan 31, 2014
best probiotic for the price that i found
deborah h on Dec 26, 2013
One of my older thoroughbreds was having trouble maintaining weight. This was recommended by another trainer and it seems to be helping him.
Linda L on Dec 16, 2013
This was recommended by a friend...
Tracy W on Dec 11, 2013
great for my older horses. Vet approves of this as a supplement for them.
Roseann B on Mar 6, 2019
great product well priced
Roseann B on Jan 4, 2019
Is this good for horses that are prone to ulcers? How exactly does it help them?
CYNTHIA M on Jan 2, 2019
BEST ANSWER: I do feed my horses this to help keep their digestive system a boost. It is more of a probiotic product. Horses prone to ulcers would probably benefit more from an omprazole product such as gastromax. If you know they will be in a stressfull situation like vet, trailering, showing, breeding etc. you can give them a dose. You do not need to give them the whole syringe as the directions state except for the 1st time (a loading dose) but for maintenance use the single dose on the applicator. Quite a few Horses are suspectable to ulcers when stressed and this medication might give them a chance to get ahead of ulcer production or exacerbation. Ulcers can be caused by many factors (physiological) which you might want to discuss with your vet.
I have an adult mare that eats the manure in the pasture. I've heard that adding probiotics can help eliminate the problem. Does anybody know if adding this to the diet could help?
karen r on Oct 25, 2017
BEST ANSWER: I have a mare that has symptoms of ulcers and a loose stool so i give her Opti-Zyme and U-Gurd and that helps her with her hind gut. Has good formed stool where before was watery. I don't feed grain i feed pelleted
feed so no grain left in the manure. She may be looking for grain left in the manure if you feed grain. My horses will look under manure if left out on the pasture to see if any grass is growing under there. They move the manuer around but they don't eat it. I try to pick it up daily. Hope this can help. May need to ask your vet for answers.
does this come in larger bags?
Arlene K on Oct 5, 2015
BEST ANSWER: I have only seen the one size bag. I feed it daily to horses. It does last quite awhile. What I do is buy like 10 bags at a time and store the extras in a cool dry place (basement); no problems at all with it.
I have a horse who was out on lush pasture all summer and is still on the skinny side. With winter coming I need her to gain some padding, could this help with that?
A shopper on Oct 18, 2016
BEST ANSWER: Can't hurt, might help. I wouldn't try it all by itelf but make it part of a feeding program. Since I am unfamiliar with your pasture, I don't know if lush means high enough water content that is is hard to get enough food on a dry matter basis. I like to address weight gain with more/better food. Pelleted hay is my favorite because it is easy to store and feed and weigh. Different feedstuffs have different availability in locations. Stable Mix pelleted feed is popular around here and there are many different formulations to choose from.
Can you feed it as likd trying to not get colic? Like will it help the odds?
Ringa on Apr 19, 2016
BEST ANSWER: This can help but not prevent colic. I have used daily for a pony and mare that would colic every spring, and fall and sometimes even in winter w/new hay. I also provide tons of fresh air, NO stall time, no over grazing which can start a colic. This is a great product that has helped me a ton. Knock on wood I have not had a colic in over 2 years since I began using this product. Keep in mind, I limit my pony and Mare on pasture (2 hrs max) daily, reduced hay intake, I feed ZERO grain, ZERO treats, and they are outside 24/7 w/access to shelter if needed and lots of fresh clean water. They lick their buckets clean with this product too, so it must taste good. Even my vet asked what I was doing. Makes their coats shiny and pretty as well. You can tell they feel better in their guts. No more biting at tummy either. I love this product!