Can D₂, D₃ and hydroxylated derivatives share one report?

Identify D₃, D₂ and derivatives separately. A combined A/D₃ label can declare both potencies; adding them would overstate D₃.

Separate D₃ potency, carrier and processing stage

Record D₃ activity, units per gram of preparation or kilogram of product, and carrier. Retain samples through the planned process. Enter the vitamin A contribution separately.

How should the two potency figures on an A/D₃ premix be used?

Calculate A and D₃ separately. Adding the two values does not give D₃ potency. Single-vitamin premixes: Calculate the active dose from lot-specific vitamin D₃ potency in IU/g. Check uniformity at low inclusion. Heat processing of pelleted feed: Use an identical conditioning cycle. Measure D₃ before and after pelleting and monitor changes in retained storage samples.

Checking Vitamin D₃ potency and Carrier composition

Vitamin D₃ potency (IU/g): Declare potency per gram or per kilogram of the as-supplied preparation. Agree the method and the point at which potency is guaranteed. Carrier composition (Ingredient declaration / % by mass): Specify carrier and active-ingredient basis. Assess powder, liquid and protected forms separately. Retention after processing (%): Measure activity before and after processing by the same method and correct for moisture. Record temperature, residence time and cooling conditions.

What to record

  • Active identity
  • D₃ potency units
  • Carrier
  • Potency before processing
  • Potency after processing

Technical references

Products and processes

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