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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Starting a meadery and need nutrients in bulk
Jason R on Jan 10, 2022
David K on Dec 20, 2021
Starting a meadery and need nutrients in bulk
Jason R on Jan 10, 2022
Organic nutrient for mead fermentation
Adrian B on Dec 23, 2021
David K on Dec 20, 2021
Following recipe.
nadia m on Dec 17, 2021
Why wouldn't you use this nutrient?
Micah E on Dec 10, 2021
Recipe in BYO recommended this for Mead
D S on Dec 7, 2021
John M on Dec 2, 2021
mead yeast need help
Andy G on Nov 19, 2021
Doing the most
Mark S on Nov 18, 2021
Need a good yeast nutrient for starters.
Stephen B on Nov 13, 2021
Fermenting Mead
PEDRO LUIS ROMERO M on Nov 5, 2021
Fermaid O is an organic version of Fermaid K, which ensures there is enough nutrients in the must
Chris Miller on Oct 8, 2021
Use in fermentation
David V on Oct 8, 2021
Has worked well in the past
Terence C on Oct 8, 2021
i really need it
Marc F on Oct 8, 2021
I like that this nutrient is organic and it has always worked extremely well for me in wines and meads.
Robert S on Sep 30, 2021
to use in wine making
Robert Rosser on Sep 30, 2021
1st time winemaker - first batch of nutrients/supplies
Rory C on Sep 28, 2021
Need it for fermentation
David V on Sep 22, 2021
recommended for the wine I am making
Michael H on Sep 18, 2021
same as above
MARK P. on Sep 17, 2021
To enhance fermentation
Elisa A on Sep 16, 2021
Jake H on Sep 16, 2021
Help with fermentation.
Andrew C on Sep 14, 2021
Good results, used for 10+ years
Marion Lovell on Sep 9, 2021
I trust MW 's recommendations.
Greg Thomsen on Sep 5, 2021
Organic nutrient
Quentin K on Sep 4, 2021
prefer organic
Craig K on Aug 31, 2021
Used last year
Thomas L on Aug 28, 2021
It does what is advertised
tony p on Aug 27, 2021
Worked well before.
Terry S on Aug 26, 2021
Happy yeast, happy feast!
Robert F on Aug 24, 2021
recommended by Mfg.
Brent J on Aug 24, 2021
Great yeast food
Chris H on Aug 19, 2021
recommended from supplier
Ethan B on Aug 13, 2021
Leonardo E on Aug 11, 2021
I prefer the organic forms of yeast nutrient
Clay S on Aug 6, 2021
Part of a recipe
Matthew R A on Aug 6, 2021
Online recommendations from wine blog
Douglas S on Aug 4, 2021
I like the fact that it is an organic nutrient mixture
Lesli G on Jul 24, 2021
havenot tried this one yet.
thomaseknudsen on Jul 6, 2021
for the wine
Maria P on Jul 1, 2021
for mead
Jim S on Jun 24, 2021
Best nutrient for mead. Had to find locally so i bought a lot.
eric w on Jun 3, 2021
Kveik yeast reportedly has a high nutrient requirement
SCOTT T on Jun 1, 2021
mead nutrient
Ethan C on May 27, 2021
A group who makes mead tell me this is all important.
Brandt B on May 15, 2021
Lee B on May 7, 2021
Mead Making
Stephan S on Apr 1, 2021
Nathaniel G on Mar 28, 2021
Organic nutrient for mead fermentation
Adrian B on Dec 23, 2021
Following recipe.
nadia m on Dec 17, 2021
when is fermaid o introduced into the wine must?
Anthony DAmico on Oct 25, 2021
BEST ANSWER: There are a few technical terms and measurements you could use to decide but I add mostly on instinct. 2 doses are recommended at 20g/100liter (hL) and I do #1 at the first sign of yeast activity (foam cap) and #2 2-3 days later. The second dose is supposed to correspond to 1/3 of the sugar being consumed, which could be 1 day for a warm ferment with an aggressive yeast or a month with a wild ferment really cold. Mine are usually slower yeasts around 60degs and I have found 2-3 days to be that point. Also it is less critical when it happens if you use rehydration nutrient (GoFerm) to start your yeast, solid fermenting yeast strains and minimize other factors that can cause yeast stress (temp swings, overclarification, etc)

4.9 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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
9 months 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
1 year 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
1 year ago
Rated 5 out of 5
Good product
Good product! Recommended by the pros.
June 14, 2020
1 year ago
Rated 5 out of 5
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 3 years ago
Rated 5 out of 5
Fermaid O
Thanks for the fast service! This nutrient did what was supposed to do! thanks!
July 6, 2018
over 3 years ago
Rated 5 out of 5
Highly recommended for cleaner faster drinking mead with staggered nutrient additions
February 22, 2018
over 3 years ago
Rated 4 out of 5
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 3 years ago
Rated 5 out of 5
Great product. Does the job, and it’s organically derived.
January 31, 2018
over 4 years ago
Rated 5 out of 5
fermaid o 120 g
product as described, fast shipping
January 28, 2018
over 4 years ago