Fermaid O

Fermaid O

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Fermaid O is a newer formulation of the same Fermaid K that winemakers everywhere have learned to trust their ferments to. The main difference in composition between the two, is that the Fermaid O has replaced the inorganic DAP with an organic source. In terms of how this benefits the winemaker, there are several points!


  • Organic Nitrogen is easier for your yeast to digest, resulting in a smoother, more consistent fermentation.
  • Fewer fermentation spikes means better yeast health, and the ability to ferment to its full capacity.
  • Compared to DAP, Fermaid O will result in lower heat output from the yeast, and lower levels of negative sulfur compounds.

This is a nutrient which will boost the quality of wine, regardless of process. Lower heat production, less negative flavor compounds, better overall fermentation kinetics and flavors!

To Use:
Use at a rate of 1.5g / gal of must/juice.

Community Q&A

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Why did you choose this?
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For TOSNA mead making method
Scott B on Jul 9, 2019
I follow religiously your manual !
Valentin P on May 17, 2019
For TOSNA mead making method
Scott B on Jul 9, 2019
Not trying to have stuck ferments
Kian T on Jul 1, 2019
I follow religiously your manual !
Valentin P on May 17, 2019
Mead making
Jacob B on May 8, 2019
used it in the past
michael a on May 8, 2019
making mead
David D on May 3, 2019
this is the best yeast nutrient for the SNA, staggered nutrient addtion
Jeff P on May 1, 2019
Same as for yeast
Jim S on Apr 15, 2019
history of good results
michael a on Apr 10, 2019
thought I'd try
Edwin W S on Mar 25, 2019
Organic nutrient used in mead and wine making.
D A on Mar 14, 2019
Industry Standard
Colton M on Mar 7, 2019
I often follow a TOSNA protocol when making mead.
Kenneth Hesser on Jan 8, 2019
Making mead
Matt on Jan 1, 2019
Yeast nutrition during fermentation.
Dan L on Dec 18, 2018
Healthy fermentation make good wines
Scott H on Dec 15, 2018
Bray Denard from Denard Brewing said it makes the most aromatic meads
Susan K on Dec 12, 2018
Starting to do meads, and this seems to be the most frequently recommended nutrient for SNA
Ian C on Nov 27, 2018
To fill out the minimum order for free shipping
Crue K on Nov 24, 2018
Best price I could find on this nutrient for wine fermentations.
Brian J on Nov 20, 2018
I bought this to make mead and this is an important part of the process.
Jarrett R on Nov 17, 2018
Patrick S on Nov 17, 2018
for a friend
Gary p on Oct 25, 2018
great for yeast in ciders and meads
Corinne T on Oct 22, 2018
Easy to use ,proved good result in red wine making.
Yin Min Htun on Oct 20, 2018
Learned it's a better choice than Fermax
Gene C on Oct 15, 2018
Mead is my jam and Fermaid makes it smooth. Ready to drink faster using Fermaid O.
Brian K on Oct 11, 2018
Recommended from friend
Chris M on Oct 5, 2018
Heard good things.
Zach W on Oct 5, 2018
Fermentation Insurance
D O on Sep 25, 2018
already have some but to make sure I have enough of this great product
Richard Robinson on Sep 21, 2018
I have been ising for years with good results. Never had a stuck fermentation or off flavors.
David P on Sep 21, 2018
it was recommended by MoreBeer!
James K. R on Sep 19, 2018
used prior
richard r on Sep 14, 2018
good food for the must
Michael C on Sep 13, 2018
Robert M B on Sep 11, 2018
Size of batch
John G on Sep 10, 2018
your site recommended
ron D on Sep 10, 2018
Didn't want DAP
Michael M on Sep 10, 2018
Prefer the version without DAP
Matthew R on Sep 6, 2018
trying to stay organic as much as possible
Bernard L on Aug 31, 2018
just been a better syetem for me to start yeast
shawnte a on Aug 30, 2018
Replacement order.
Bob De L on Aug 28, 2018
Doug J on Aug 24, 2018
perfect food for yeast at 1/3 the way through fermentation
James D on Aug 23, 2018
Works for wine production
Steven E on Aug 22, 2018
Recommended over Fermaid K for mead making and low nutrient ferments
Scott B on Aug 22, 2018
This organic product insure the yeast will have enough nutrients to complete primary fermentation.
Chris M on Aug 21, 2018
Provides an Organic Nitrogen source
Chris H on Aug 15, 2018
yeast food
Jason W on Aug 10, 2018
Not trying to have stuck ferments
Kian T on Jul 1, 2019
Mead making
Jacob B on May 8, 2019

4.3 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Prefer the K
Fermaid O is much harder to dissolve than Fermaid K. It clumps and sticks to the measuring spoon. The results are fine but this is step down from Frmaid K.
November 8, 2018
9 months ago
Fermaid -o no
Arrived caked and undisolveable , haven’t had that trouble with Fermaid K
October 24, 2018
9 months ago
First time experience
I just used Fermaid O in a batch of Black Raspberry (which I grow) wine. I had a good but not foamy fermentation. Fermented down to SG 0.992. So, based on this one experience, I can recommend it, as it does it's job. Bigger tests for it as the harvest season approaches... Cheers!
August 10, 2018
12 months ago
Fermaid O
Thanks for the fast service! This nutrient did what was supposed to do! thanks!
July 6, 2018
1 year ago
Highly recommended for cleaner faster drinking mead with staggered nutrient additions
February 22, 2018
1 year ago
Working as expected so far
I'm using the Fermaid O as my sole nutrient in the mead. Way to early to judge how it will come out, but it seems to be fermenting as expected.
February 20, 2018
1 year ago
Great product. Does the job, and it’s organically derived.
January 31, 2018
1 year ago
fermaid o 120 g
product as described, fast shipping
January 28, 2018
1 year ago
Major Improved Mead Fermentation
This product has been the biggest improvement in my mead fermentations so far. I first used this with DAP but have recently moved to an all Fermaid O fermentation and my meads have never been this clean tasting so early. I cannot recommend this product enough.
January 24, 2018
1 year ago
Just what the doc ordered
This product does very thing it says it does. I would risk fermenting without it!

August 30, 2017