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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.
Community Q&A

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mead recipe called for it
E. S on Jun 8, 2018
This is essential
robert f on Apr 18, 2018
mead recipe called for it
E. S on Jun 8, 2018
mead recipe
Frank on May 29, 2018
This is essential
robert f on Apr 18, 2018
No problems at the end of fermentation, yeast can still assimilate it.
Craig E on Apr 3, 2018
Good YAN source for sugar washes
Frank C on Mar 25, 2018
ran out of my stock at home
carl w on Mar 16, 2018
need nutrient, and no DAP
David M on Mar 6, 2018
Better than fermaid K
Roger T on Feb 24, 2018
Needed for mead recipe
Donald M on Feb 15, 2018
For Mead Making
Valued C on Feb 2, 2018
To make fast, clean mead
John A on Jan 30, 2018
I read that yeast handle this better than the inorganic sources of nitrogen.
Chris D on Jan 25, 2018
recommended at cider days as a good ferment nutrient
Butternut Farm L on Jan 25, 2018
To feed my mead
Brandon H on Jan 17, 2018
For mead nutrients
Danielle S on Jan 15, 2018
Yeast starter for out of date yeast
Mark A P on Jan 12, 2018
mead recipe
Frank on May 29, 2018
No problems at the end of fermentation, yeast can still assimilate it.
Craig E on Apr 3, 2018

4.9 / 5.0
7 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Highly recommended for cleaner faster drinking mead with staggered nutrient additions
February 22, 2018
4 months 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
4 months ago
Great product. Does the job, and it’s organically derived.
January 31, 2018
5 months ago
fermaid o 120 g
product as described, fast shipping
January 28, 2018
6 months 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
5 months 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