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.

Like Fermaid O? Then you will love CellarScience™ FermFed DAP Free Yeast Nutrient!

Community Q&A

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Why did you choose this?
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I need it
Anthony M on Aug 8, 2020
Based on what ive learned from online, videos, and group chatrooms for making mead/wine. This product was suggested.
Ryan G on Aug 7, 2020
I need it
Anthony M on Aug 8, 2020
Jeff S on Aug 7, 2020
Based on what ive learned from online, videos, and group chatrooms for making mead/wine. This product was suggested.
Ryan G on Aug 7, 2020
Recipe called for
Matthew C on Aug 7, 2020
it is part of a recipe
Dennis H on Jul 23, 2020
Learned about it in BJCP Mead Judge class
Art Fitz F on Jul 22, 2020
First time trying, normally use k
Mark S on Jul 14, 2020
Best way to feed a mead fermentation
Louis LeBlanc on Jun 30, 2020
I am experimenting with yeast nutrients for hard seltzer.
Curtis T on Jun 28, 2020
recommended by morebeer
Dennis C on Jun 20, 2020
Use in mead making
Brandon P on Jun 13, 2020
New to
Marc F on Jun 6, 2020
Good product, good reviews, way to go!!
Paula LaRocca on Jun 1, 2020
Using yeast strains with higher nutrient requirements.
Susan Ingber on May 16, 2020
Need a new chain to kick-off fermentation
Stephen T on May 12, 2020
we prefer organic and reviews were good
Linda B on May 6, 2020
Wanted organic food for my mead
William F on May 4, 2020
better start
Robert W on Apr 23, 2020
Nutrition for mead
Tiffany m on Apr 22, 2020
Trying it out. Usually use Fermaid K and DAP.
Rudy Mead T on Apr 22, 2020
The TONSA protocol is really simple and effective
Zeph O on Mar 27, 2020
making a red blend
Richard S on Mar 23, 2020
Mead making
Connor S on Mar 19, 2020
always use during ferment
Glen Kusko on Mar 2, 2020
Yeast nutrient that prevents temperature spikes
Mihai Bordea on Mar 2, 2020
High gravity mead, need more than 5g, but not 500
Kyle M on Feb 19, 2020
Making 15 of Syrah from Australian Shiraz juice
Kian T on Feb 17, 2020
I am making mead and will be doing SNA (standard nutrient addition).
Thomas on Feb 15, 2020
it is organic
michael m on Feb 6, 2020
Trying a mead
Valued C on Jan 15, 2020
make some mead
Ken Orner on Jan 15, 2020
I use this for my scheduled nutrient additions for meadmaking
David W on Jan 1, 2020
jeremiah g on Dec 23, 2019
I have used this item for 3 years and it assures good quality of red wine.
Yin Min Htun on Dec 19, 2019
Cleaner and aromatic fermentation
Chi H on Dec 12, 2019
Make lots of Mead
Robert G on Dec 5, 2019
Suggested by another person to help with fermentation
Constance S on Dec 3, 2019
have used many nutrients in different situations and this one takes almost al of the risk of problems out while still maximizing flavors with a slower ferment
Stephen B on Nov 26, 2019
mead SNA
David K on Nov 22, 2019
late harvest grapes may need nutrient boost
Recommended by wine-making colleague.
Doug H on Oct 26, 2019
Minimizes off flavors in my fermentations
Matthew M on Oct 25, 2019
to make better mead
Mattox B on Oct 24, 2019
Wanted an organic yeast nutrient
Justin Z on Oct 22, 2019
Preferred yeast nutrient during fermentation
John r on Oct 17, 2019
you told me to
john l on Oct 16, 2019
2 lbs lasted me a year ... in that time I learned I made good mead and wine using it.
Gene C on Oct 14, 2019
Because yeast often needs an extra boost to keep on the right track (and to limit fermentation spikes)
Chris G on Oct 9, 2019
Use every option for a good fermentation.
Stan S on Oct 4, 2019
Running out again. Love this stuff.
Brian K on Oct 3, 2019
Jeff S on Aug 7, 2020
Recipe called for
Matthew C on Aug 7, 2020

4.9 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Good product
Good product! Recommended by the pros.
June 14, 2020
2 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
over 2 years ago
Fermaid O
Thanks for the fast service! This nutrient did what was supposed to do! thanks!
July 6, 2018
over 2 years ago
Highly recommended for cleaner faster drinking mead with staggered nutrient additions
February 22, 2018
over 2 years 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
over 2 years ago
Great product. Does the job, and it’s organically derived.
January 31, 2018
over 2 years ago
fermaid o 120 g
product as described, fast shipping
January 28, 2018
over 2 years 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
over 2 years ago
Just what the doc ordered
This product does very thing it says it does. I would risk fermenting without it!

August 30, 2017
great product but beware...
Great product but keep it away from your cats! Two years in a row our cats have pulled this out of a box and gone nuts with it ripping the bag open and spreading it all over the place. It seems to have a more powerful draw than catnip.
October 11, 2016