Fermaid O Yeast Nutrient

Fermaid O Yeast Nutrient

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The Fermaid line of products are a range of nutrients that have been adopted from winemaking and put to use supporting beer fermentations as well.

Fermaid O is a newer formulation of the long trusted Fermaid K nutrient which replaces the inorganic DAP in Fermaid K with an organic source of nitrogen instead. The organic nitrogen in Fermaid O is better for your yeast, and that results in better beer!
Organic Nitrogen is easier for your yeast to digest, resulting in a smoother, more consistent fermentation. Fermaid O fermentations show fewer temperature spikes, which minimizes negative effects that can be caused by heat. Compared to DAP, Fermaid O results in more consistent and complete fermentation, and lower levels of negative sulfur compounds and other off-flavors.
Use at a rate of 1.5g / gal of wort. Dissolve in a small amount of wort or water and add to your fermenter at pitching.
Like Fermaid O? Then you will love CellarScience™ FermFed DAP Free Yeast Nutrient!
Community Q&A

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Browse 2 questions Browse 2 questions and 4 answers
Why did you choose this?
MoreFlavor Store
Recommended by a commercial winemaker
brian h on Feb 22, 2023
Christopher D on Feb 8, 2023
Recommended by a commercial winemaker
brian h on Feb 22, 2023
need it
Cynthia r F on Feb 10, 2023
Christopher D on Feb 8, 2023
Making mead
Joseph on Feb 6, 2023
Want to feed my yeast.
Christopher C P on Jan 25, 2023
need it, plus i've heard ferm K has DAP in it
Alexander F on Jan 13, 2023
ferment like a pro
Jerold J C on Jan 11, 2023
Want to learn brewing.
Valued C on Dec 17, 2022
To nourish my yeast during fermentation
Lori W on Dec 14, 2022
Jump start fermentation
Jerry G on Dec 9, 2022
First try to make white wine .
Minji K on Dec 2, 2022
price and previous performance
William S on Nov 24, 2022
yummy for yeast
Vincent C on Nov 24, 2022
Proven results at our winery and cidery
Mark B on Nov 8, 2022
Haven’t tried yeast nutrient in any of my meads and I wanted to see how it does.
Phil R on Oct 20, 2022
to start the process better
Samuel E A on Oct 15, 2022
Great product
Vincenzo LaValle on Oct 7, 2022
To make the juice
Raymond O on Oct 6, 2022
Nutrients are a must
Travis B on Oct 5, 2022
Healthy yeast during fermentation
Marshall C on Sep 29, 2022
it has always provided reliable fermentation
David P on Sep 29, 2022
heard it was the best
warren b on Sep 22, 2022
works well
Jim G on Sep 20, 2022
Great, more efficient nutritional source than Fermaid K. You need to pay attention to quantity used, as it's dosed differently than Ferm K.
Edward B on Sep 16, 2022
Reliable for starting fermentation
Michael L on Sep 15, 2022
Always works
Andrew Stephen H on Sep 13, 2022
Using yeast selections I have never used, both call for a nutritious must according to the spec.sheet.
Tom D on Sep 10, 2022
Seems to help with clean fermentation.
Joseph A. Wilson on Sep 6, 2022
organic nitrogen provides steady-rate fermentation; yeasts take it up and use it as required.
John Overholt on Sep 2, 2022
good nutrition
Patricia C on Aug 25, 2022
Because its the best nutrient out there
Gregg O on Aug 24, 2022
I've used this before with great results/
MICHAEL S H on Aug 24, 2022
recommended by enology professor
KUEHN C on Aug 17, 2022
Because B3 recommends using it...
Bryan I on Aug 11, 2022
Best fermentation nutrient
Damien A on Aug 10, 2022
Worked Great Last Year
David G on Aug 5, 2022
Standard choice , feed the yeast
Dean K on Aug 3, 2022
Helps balance fermentation
Dominic A on Jul 30, 2022
For mead
James M on Jul 23, 2022
To keep my yeast happy during fermentation
John H on Jul 20, 2022
My standard procedure making mead
Wanna make mead
Tanner A on Jul 14, 2022
Used before
Lloyd W Fryer J on Jul 4, 2022
Russ H on Jun 26, 2022
Recommendation from a friend
Chuck T on Jun 23, 2022
hard seltzer
David J E on Jun 17, 2022
When used properly, this product gets mead to fully ferment in about a month
Gary M on Jun 6, 2022
need it
STEEN SIGMUND on May 9, 2022
It does not contain urea.
dennis on May 5, 2022
Cheapest fermaid o I could find
Andrew K on May 3, 2022
need it
Cynthia r F on Feb 10, 2023
Making mead
Joseph on Feb 6, 2023
when is fermaid o introduced into the wine must?
Anthony DAmico on Oct 25, 2021
BEST ANSWER: A lot of it depends on what you're making and the yeast you're using. Wine's have a bit of nutrient and I'll usually wait a couple days and give them small doses maybe 3 times, spread out over the fermentation. Never had an issue with that and my wines ferment dry very happily. Meads I'll usually put Ferm O in at the start because honey doesn't have much nutrient so I make sure it's a good environment to get it going.
You also have to look at the yeast you're using. Some will say they don't need much Nitrogen, others have high nitrogen demands. You want to feed the ones that need nitrogen more often to make sure they aren't stressed.
The dosage rage is listed as 1.5g/gal of must/juice. The Fermaid O spec sheet lists the dosage rate at 20g/hL (or about .7g/gal). Which one is correct (or better)?
Barry P Landaiche on Apr 11, 2022
BEST ANSWER: Really depends on what you need and what you are fermenting..
Comparing 1gal is quite different than a hL. It's not completely linear when scaling up in size between homebrew vs commercial. Their suggested rates are different, but so is their whole setup.

Regarding your question, depends more on what you are fermenting and how high your gravity. If I'm making a simple wine or cider, I usually add around 1.5g/gal. But I'll use less if I'm using whole fruit, maybe 1.0g/gal when I pitch yeast. I may do another nutrient addition after a couple days if there are signs of a stressed fermentation.

If doing mead or sugar wash, I'd aim for the higher nutes 1.5g/gal.

If you really want to dose appropriate, look up TOSNA. I think the site Meadmaderight has a really easy free calc to help.

4.9 / 5.0
19 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Yum Yum
Brown speed powder make yeast go brrr.
July 17, 2024
Rated 5 out of 5
O better than K
O is harder to dissolve than K but makes you he yeast work harder and results in a better product!
September 23, 2023
over 6 years ago
Rated 5 out of 5
Looking forward to trying it
October 28, 2022
1 year ago
Response from MoreFlavor
We are so sorry to hear about your bad experience with the Fermaid. You are still within our return policy and warranty window for a damaged product. Please go to our website, scroll to the bottom of the page, and use the Return an Item form and we will set you up. Cheers!
November 4, 2022
Malcolm lieban
Rated 5 out of 5
Robust Ferment
Used a couple of yeasts that it is claimed need nitrogen. No sulfur no stuck ferment. Seems like the yeast must’ve gotten what it needed.
October 2, 2022
1 year ago
Rated 5 out of 5
great product, works as described.
great product, works as described.Write your review here. It must be at least 20 characters long. Consider whether you would recommend this product and what you like or dislike about it.
February 23, 2022
over 2 years ago
Rated 5 out of 5
Best nutrients
Want your brews to ferment as well as possible? Feed your yeast the best nutrients. Fermiad-O in TOSNA3.0 will help you get there.

My only complaint is the bag is not resealable. Otherwise, great product.
February 16, 2022
over 2 years ago
Rated 5 out of 5
Fermaid O
I have not had any problems with off aromas during fermentation since I started using this. It keeps the yeast really happy.
January 17, 2022
over 3 years ago
Rated 5 out of 5
Hard Seltzer
I’m using Formaid O to insure a complete fermentation of sugar. It seems to be making a difference.
December 7, 2020
over 3 years ago
Rated 5 out of 5
Great product. Will buy again.
A good product for higher surgar musts to ensure a likely successful fermentation.
October 27, 2020
over 3 years ago
Rated 5 out of 5
Good product
Good product! Recommended by the pros.
June 14, 2020
over 4 years ago