---
product_id: 66916132
title: "CellarScience - AD332B Fermaid O (120 g), 4.2 Ounce (Pack of 1)"
brand: "cellarscience"
price: "€ 46.17"
currency: EUR
in_stock: true
reviews_count: 10
url: https://www.desertcart.gr/products/66916132-cellarscience-ad332b-fermaid-o-120-g-4-2-ounce-pack
store_origin: GR
region: Greece
---

# Enhances yeast health Reduces heat spikes Organic nitrogen boost CellarScience - AD332B Fermaid O (120 g), 4.2 Ounce (Pack of 1)

**Brand:** cellarscience
**Price:** € 46.17
**Availability:** ✅ In Stock

## Summary

> 🍷 Elevate your brew game—because happy yeast make legendary flavors!

## Quick Answers

- **What is this?** CellarScience - AD332B Fermaid O (120 g), 4.2 Ounce (Pack of 1) by cellarscience
- **How much does it cost?** € 46.17 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/66916132-cellarscience-ad332b-fermaid-o-120-g-4-2-ounce-pack)

## Best For

- cellarscience enthusiasts

## Why This Product

- Trusted cellarscience brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted by Pros:** Highly rated with 4.7 stars and a staple in craft fermentation communities.
- • **Precision Dosing:** Easy 1.5g per gallon formula ensures consistent, repeatable fermentation results.
- • **Heat Spike Control:** Minimizes fermentation temperature surges to protect delicate yeast performance.
- • **Pure Organic Nutrients:** Supports robust yeast growth with natural nitrogen sources for cleaner, richer flavors.
- • **Versatile Brewing Ally:** Ideal for nutrient-poor meads and wines, turning challenging batches into crowd-pleasers.

## Overview

Fermaid O is a premium organic yeast nutrient designed to optimize fermentation by providing essential nitrogen and nutrients. It reduces heat spikes during fermentation, promoting healthier yeast activity and superior flavor development, especially in nutrient-deficient meads and wines. Trusted by brewers for consistent, high-quality results.

## Description

Contains organic sources of nitrogen, not damp, along with nutrients for a healthy fermentation with less heat spikes. Better yeast health equals better flavors. Use 1.5G per gallon. Rehydrate in distilled water and add at 1/3 sugar depletion.

Review: Fermaid O is HUGE for Meadmaking - Fermaid O is supremely helpful if you brew stuff that isn't nutrient rich for yeast; I brew meads without much else in the recipe so the rather hostile atmosphere can cause a more stressed out yeast. Fermaid O improves the quality of my brew, and the value of that for the money is enough that I won't go without it. Pros: -The standard for organic yeast nutrition -Preferred over inorganic yeast nutrition -I feel it improves the taste and smell of what I ferment Cons: -People get riled up over using it or not Happy yeast make happy ferments; I keep my yeast happy by using Fermaid O.
Review: Fermaid O great for fermentation - Since starting to use a couple grams in each fermentation has been more consistent and less worry about stalling. Every batch gets this now.

## Features

- Package Dimensions: 5.69 L x 0.81 H x 5.44 W (inches)
- Package Weight : 0.25 pounds
- Country of Origin : United States
- Part number: AD332B

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B074D9HQJD |
| Best Sellers Rank | #136,991 in Grocery & Gourmet Food ( See Top 100 in Grocery & Gourmet Food ) #254 in Beer Brewing Ingredients |
| Customer Reviews | 4.7 4.7 out of 5 stars (341) |
| Date First Available | July 29, 2017 |
| Item Weight | 4 ounces |
| Item model number | AD332B |
| Manufacturer | CellarScience |
| Package Dimensions | 7.8 x 5.87 x 1.69 inches |

## Product Details

- **Brand:** CellarScience
- **Item Form:** Powder
- **Item Weight:** 0.25 Pounds
- **Number of Items:** 1
- **Unit Count:** 4.2 Ounce

## Images

![CellarScience - AD332B Fermaid O (120 g), 4.2 Ounce (Pack of 1) - Image 1](https://m.media-amazon.com/images/I/514eBYMLRhL.jpg)

## Questions & Answers

**Q: Is there an expiration date?  Is it good for more than 2018?  And does it require refrigeration, or just cool dark?  Thx**
A: Generally, we would recommend using the product within 12 months after opening. Refrigeration would be best, but is not required for storage.

**Q: What is the difference between A & B?**
A: AD332A has 12 grams of product while AD332B has 120 grams.

**Q: Do you add an additional 1.5 grams at 1/3 depletion? Or are you splitting the 1.5 grams? Also do you add it immediately?**
A: There are two schools of thought on this:
1. add at 24 hrs/48 hrs/72 hrs.  Less specific than:
2. add at yeast pitch/25% depletion/33.3% depletion.
YMMV

**Q: Fermaid o is manufactured by lallemand, but this listing shows the manufacturer as "cellularscience". who is cellularscience? is this genuine?**
A: I believe that Lallemand's smallest package size is 2.5kg. Cellularscience repackages the several products into smaller retail size packages.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fermaid O is HUGE for Meadmaking
*by C***E on December 27, 2025*

Fermaid O is supremely helpful if you brew stuff that isn't nutrient rich for yeast; I brew meads without much else in the recipe so the rather hostile atmosphere can cause a more stressed out yeast. Fermaid O improves the quality of my brew, and the value of that for the money is enough that I won't go without it. Pros: -The standard for organic yeast nutrition -Preferred over inorganic yeast nutrition -I feel it improves the taste and smell of what I ferment Cons: -People get riled up over using it or not Happy yeast make happy ferments; I keep my yeast happy by using Fermaid O.

### ⭐⭐⭐⭐⭐ Fermaid O great for fermentation
*by C***D on December 28, 2023*

Since starting to use a couple grams in each fermentation has been more consistent and less worry about stalling. Every batch gets this now.

### ⭐⭐⭐⭐⭐ Great
*by C***A on December 9, 2025*

Kept my yeast happy

## Frequently Bought Together

- CellarScience - AD332B Fermaid O (120 g), 4.2 Ounce (Pack of 1)
- Fermtech - Auto Siphon Mini with 6 Ft of Food Safe Tubing & Clamp - Easy Home Brewing, Winemaking Kit, Complete System for Beer, Wine, Liquid Transfer & Fermentation Tools - Perfect for Small Batches
- Five Star - 6022b_ - Star San - 32 Ounce - High Foaming Sanitizer

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-03-07*