

🍷 Master your fermentation game with Fermaid O — because your brew deserves the best!
Fermaid O is an 8 oz organic yeast nutrient designed to optimize fermentation by providing essential nitrogen, lowering peak fermentation temperatures, and improving fermentation kinetics. It reduces sulfur off odors like H2S, ensuring cleaner aromas and better control over your brew. Easy to use by suspending in water or juice, it’s trusted by homebrewers and backed by a 30-day replacement guarantee for peace of mind.






























| Customer Reviews | 4.0 out of 5 stars 14 Reviews |
J**N
Works as should and fresh
Great stuff and great container
T**L
Works great.
Works great. Forgot to get more nutrient before starting another batch and got this expedited. Bubbles slowed way down and I was darn near a stall. Then the package arrived, I dosed and those yeast are going crazy now, but with no cap because I put bentonite in up front. Looks like I have a good one going.
A**R
Is this a joke???
Idk how to feel honestly. Hopefully it’s still good product. It looks like it’s been opened and used before according to everything I’ve seen…. Honestly not a fan about that. Edit* Will be adding photos every time I receive a damaged product.
M**N
Shelf life problematic
Thought I'd get value out of ordering a larger amount, but soon after I opened it the powder began to clump in the humidity and after the first year eventually turned into a unmanageable hard clay, so I ended up having to toss about 3/4 of the whole thing. Unless you need 8 oz for very large batches of mead/wine, you're better off just ordering the smaller sizes.
T**Y
It works as intended
Didn't kill my yeast
I**Y
Good for giving your yeast a nutritional boost
I don't brew that often as I really don't drink anymore, but when I get the brew bug, I dont stop until I fill my wine rack. This product is a sure fire way to ensure your yeast has the nutrition it needs to start and maintain a good healthy colony for fermenting. Especially in meads, where the honey nutrition is relatively low. I've used about 12 teaspoons of this so far and while I can't see a difference, the meads I've made with this have fermented out from 1.100 down to .994 - .992, which may be the D47 yeast or it maybe the Fermaid O helping it. I can say that without it, the ferments have taken days to weeks longer. What I dont like is that the container must allow for moisture to get in because after owning this for a while, the product has made one big clump and needs scrapped around a bit to loosen up some of the product, but thats to be expected when living in a high humid environment. All in all, I can't tell a decernable difference in yeast health or brew quality, but this has all the right ingredients, so why wouldnt you give your yeasties all the extra help they could use?
A**R
always helps! quality product
great stuff
A**R
Has never let me down
Fermaid is just the best. Ive always has rock solid fermentations with this and the price is right
Trustpilot
Hace 1 mes
Hace 1 mes