• With the exception of reactions after long-term
  ingestion of preformed vitamin A, vitamin D & B6,
  vitamin side-effects that occur are rapidly reversible
  on withdrawal of the supplementation and leave minimal
  or no lasting effects. Note: partypacks contain
  betacarotene which is non-toxic form of vitamin A ie.
  only generates as much vitamin A as is required, and
  no vitamin D or B6).
  
  

From this review, it should be apparent that the vitamins have a
high safety ratio, even when administered in daily doses that
substantially exceed the RDA's. It should be noted that
antibiotics are reduced in their effectiveness when taken with
supplements - take supplements at least an hour before or 2
hours after prescription antibiotics.

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