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	Light	Oxidizing Agents	Reducing Agents	Heat	Humidity	Acids	Alkalis
Vit. A	+++	+++	+	++	+	++	+
Vit. D	+++	+++	+	++	+	++	++
Vit. E	++	++	+	++	+	+	++
Vit. K	+++	++	+	+	+	+	+++
Vit. C	+	+++	+	++	++	++	+++
Thiamin	++	+	+	+++	++	+	+++
Riboflavin	+++	+	++	+	+	+	+++
Niacin	+	+	++	+	+	+	+
Vit. B6	++	+	+	+	+	++	++
Vit. B12	++	+	+++	+	++	+++	+++
Pantothenic Acid	+	+	+	++	++	+++	+++
Folic Acid	++	+++	+++	+	+	++	++
Biotin	+	+	+	+	+	++	++

Vitamin stability of premixes and/or after it has been blend into the diet varies greatly between vitamins. For the most part this is dependent on the various conditions of where and how the vitamin premix is stored. Moisture, heat, and the contact of vitamins with trace minerals are the most common reasons why vitamin stability is reduced. Choline chloride is hygroscopic (readily absorbs water), and when added to a vitamin premix will generally speed up the rate of other vitamin destruction. Vitamin premixes should be stored in a cool, dark and dry location. Storage length of vitamin premixes should not exceed three to six months. The more stable vitamins have potency losses of less than 1% per month whereas the less stable vitamins may loose approximatively 4 to 6% per month but could be as high as 15 to 30%, particularly when mixed with trace minerals. Also read: Vitamin Stability in Premixes and Feeds, A Practical Approach in Ruminant Diets by Michael Coelho, PhD, MBA, Marketing Manager BASF Corp., New Jersey from Proceedings 13th Annual Florida Ruminant Nutrition Symposium, pp. 127-145.