Fermaid O Organic Yeast Nutrient | 12 g & 120 g

Fermaid O Yeast Nutrient for Mead, Wine, Cider, and Beer

Fermaid O is a DAP-free organic yeast nutrient used to support clean, complete fermentation in mead, wine, cider, and beer. It is made from inactivated yeast and supplies organic nitrogen plus yeast-supporting micronutrients without relying on diammonium phosphate.

For mead makers, Fermaid O is especially useful in staggered nutrient addition schedules because it feeds yeast over the course of fermentation. Used as part of a planned nutrient schedule, it can help reduce stressed-yeast problems such as sulfur aromas and sluggish fermentation.

How much Fermaid O per gallon?

These are practical starting points. Adjust your nutrient schedule based on starting gravity, yeast strain, fruit load, and the fermentation you are making.

• Mead and wine: 1.25 to 2.5 g per gallon, often split across 2 to 3 additions.
• Cider: about 1 g per gallon, commonly added around the 1/3 sugar break.
• Beer or mixed fermentation: 0.5 to 1 g per gallon when organic yeast nutrition is useful.

Best uses

• Traditional, session, and fruit meads
• White and red wines
• Hard cider and fruit wine fermentations
• Wild, mixed-fermentation, or naturally minded beer projects
• DAP-free nutrient schedules

Related fermentation nutrients

For yeast rehydration, pair your nutrient plan with Go-Ferm Protect. For strain selection and broader mead planning, see our mead yeast selection guide.