diff -r 8d7fad771dde -r f0ca77097236 www/includes/db_product.php
--- a/www/includes/db_product.php	Wed Mar 13 20:17:15 2019 +0100
+++ b/www/includes/db_product.php	Wed Mar 13 21:31:04 2019 +0100
@@ -348,6 +348,7 @@
 			$yeast .= ',"y_flocculation":' . $item['y_flocculation'];
 			$yeast .= ',"y_attenuation":' . $item['y_attenuation'];
 			$yeast .= ',"y_cells":' . $item['y_cells'];
+			$yeast .= ',"y_tolerance":' . $item['y_tolerance'];
 			$yeast .= ',"y_inventory":' . $item['y_inventory'];
 			$yeast .= ',"y_use":' . $item['y_use'];
 			$yeast .= ',"y_cost":' . $item['y_cost'] . '}';
@@ -783,7 +784,7 @@
 			for ($i = 0; $i < count($yeasts); $i++) {
 				$yeasts[$i]['y_inventory'] = 0;   // Not in stock
 				$yeasts[$i]['y_avail'] = 0;       // Ingredient not in db
-				$sql2 = "SELECT inventory FROM inventory_yeasts ";
+				$sql2 = "SELECT inventory,tolerance FROM inventory_yeasts ";
 				$sql2 .= "WHERE name='".str_replace($rescapers, $rreplacements, $yeasts[$i]['y_name'])."' AND";
 				$sql2 .= " form='".str_replace($rescapers, $rreplacements, $yeasts[$i]['y_form'])."' AND";
 				$sql2 .= " laboratory='".str_replace($rescapers, $rreplacements, $yeasts[$i]['y_laboratory'])."' AND";
@@ -792,6 +793,9 @@
 					if ($obj = mysqli_fetch_object($result2)) {
 						$yeasts[$i]['y_inventory'] = floatval($obj->inventory);
 						$yeasts[$i]['y_avail'] = 1;
+						if ($yeasts[$i]['y_tolerance'] == 0) {
+							$yeasts[$i]['y_tolerance'] = floatval($obj->tolerance); // Upgrade alcohol tolerance
+						}
 					}
 					mysqli_free_result($result2);
 				}