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Fermaid K
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Smart brewers know that a yeast starter is the best way to ensure proper cell count and yeast viability prior to pitching. If you want a reliable starter for your batch of beer, you need to feed the yeast. Adding a yeast nutrient to the starter will give the yeast an added boost! Fermaid K is a yeast nutrient that works for starters and main fermentation. Here’s how it works:
Fermaid K is a complex formula that provides DAP, free amino acids, yeast hulls, unsaturated fatty acids, sterols; and micronutrients such as magnesium sulfate, thiamin, folic acid, biotin, calcium pantothenate, and other vitamins and minerals. Yeast use Nitrogen for protein synthesis and to maintain cellular growth. Nitrogen from the alpha amino acids contained in Fermaid K is utilized much more efficiently than from the ammonia salts like DAP. The unsaturated fatty acids and sterols available in Fermaid K are important survival factors needed to maintain alcohol resistance. They also help keep volatile acidity levels low. The cell wall fractions, available through the included yeast hulls, absorb medium chain fatty acids that are toxic to the yeast. They also provide nucleation sites to help keep the yeast in suspension. You do not need to add any additional fertilizers or DAP when adding Fermaid K. Use approximately 1 gram per gallon. Rehydrate in distilled water.
A rough approximate of weight is 1 tsp = 4.7 grams. We highly recommend using a scale to weigh the product for an accurate dose.
Community Q&A

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Why did you choose this?
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A mead recipe called for it
Mark M on Feb 15, 2018
give yeast nutrient for fermentation
Sean B on Feb 13, 2018
A mead recipe called for it
Mark M on Feb 15, 2018
Buying to try late nutrient addition to a big beer
Mary M on Feb 14, 2018
give yeast nutrient for fermentation
Sean B on Feb 13, 2018
I just started making wine and it was recommended.
H U on Feb 13, 2018
Need for yeast
Michael H on Feb 13, 2018
Gordon B on Feb 6, 2018
support healthy WLP007 yeast during fermentation of my imperial stout.
Mason W on Jan 26, 2018
love working up yeast to ensure good start (and saves money in the long run)
Erik M on Jan 17, 2018
I love the product. It really works. No more sluggish or stuck fermentations. I like it more than Fermaid O because it doesn't get hard and useless after a few months. I have no problem that it has Dap in it.
Karyl N on Jan 15, 2018
Helps with fermentation
William C on Jan 15, 2018
Needed Yeast Nutrients
Jeffrey M on Jan 15, 2018
Buying to try late nutrient addition to a big beer
Mary M on Feb 14, 2018
I just started making wine and it was recommended.
H U on Feb 13, 2018

4.5 / 5.0
12 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Works Great!!!
Works great!! I rely on this product for a healthy fermentation. It arrived quickly! Thanks!!
February 8, 2018
2 months ago
Souvignon Blanc
worked as advertised....perfect.....
January 27, 2018
2 months ago
Works but use Fermaid O instead
This product works to help ferment your mead but my meads improved so much more once I started using Fermaid O instead.
January 24, 2018
2 months ago
Wasn't as effective as I'd hoped
We didn't see much effect by adding this as recommended. We haven't tried to add more than recommended because we haven't been able to brew for several months.
January 23, 2018
2 months ago
Better than aerating for yeast reproduction?
I’ll put a pinch of this in my next starter. Fermaid K reportedly contains unsaturated fatty acids and sterols, which yeast need to reproduce (do budding). Normally, yeast use oxygen to create those molecules, and oxygen is the limiting factor.
In the brew, the yeast have 2 options: 1) make the unsaturated fatty acids and sterols on their own using the oxygen that is available in the aerated brew or 2) use existing fatty acids and sterols, which they prefer.
In short, this nutrient should help my yeast reproduce as much as they want, so I don’t have to really worry about aeration. Besides, too much or too little aeration can be bad.
January 20, 2018
1 month ago
This is a Must for your Must
I dont trust the yeast to make it to the end of my ferment on their own; especially considering the high brix levels that CA fruit tends to come in at these days (25-27 is normal). If you dont feed the yeasts during exponential growth, you risk ending with residual sugars when the colonies die off at 15%abv due to low numbers (of colonists). If you are ameliorating the must to bring the brix down (I dont as I want the fruit to speak for itself), you will still want to feed the troops during exponential growth in order to insure you get the most out of the esters. You can make up for acids but you cannot for color/flavor/nose if you ameliorate. Those happy yeasts will go get those esters even if they have to swim for them. Good stuff - been using Ferm-K for a decade and love how the must perks up a few hours after dosing.
September 29, 2015
A must for your yeast starter
I always add this to my yeast starter, for a little kick in the pants!
May 31, 2014
Good Yeast Nutrient
It works - not sure if it works better than any other generic yeast nutrient, but it works!
May 15, 2014
Gives me great fermentation.
I use this yeast nutrient for starters and fermentation and I have gotten great cell growth in my starters and great attenuation. I would like to know the zinc content of this product.
May 1, 2014
I have never had a failed batch! I have always used fermaid k and go ferm together. They are an absolutely perfect combination for nutrients!
March 2, 2014