FORMULA: 15% Yeast Extract 31% Peptone 31% Dextrose 23% Agar 65 grams of PDA is sufficient to create 1 Liter of solution which will yield approximately 40, 100mm petri dishes. YEPD or Yeast Extract Peptone Dextrose, also often abbreviated as YPD, is a complete medium for yeast growth. It contains yeast extract, peptone, Agar, water, and dextrose. By being a complete medium, YEPD cannot be used as a selection medium to test for auxotrophs. Instead, YEPD is used as a growth medium to grow yeast cultures.