diff --git a/BacterialMedia.md b/BacterialMedia.md
index 3b9ef0b..fff1da3 100644
--- a/BacterialMedia.md
+++ b/BacterialMedia.md
@@ -215,5 +215,6 @@ Dissolve 100 mg d-cycloserine (Sigma C6880) in 4 ml water. Filter sterilize usin
 ### Sodium Taurocholate (10% w/v)
 Dissolve 400 mg in 4 mL water.  Filter sterilize using a 0.45-µm filter and freeze for storage. 
 
-### Vancomycin (25 mg/mL)
-Dissolve 250 mg in 10 mL water. Store at -20˚C.
+
+### Vancomycin (50 mg/mL)
+Dissolve 500 mg vancomycin (VWR 97062-548) in 10 mL water. Store at -20˚C.