designed to reduce or minimize the possibility of an allergic response, as by containing relatively few or no potentially irritating substances: hypoallergenic cosmetics.
Also, hypo-allergenic.

1950–55; hypo- + allergenic

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World English Dictionary
hypoallergenic (ˈhaɪpəʊˌæləˈdʒɛnɪk)
(of cosmetics, earrings, etc) not likely to cause an allergic reaction

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hypoallergenic hy·po·al·ler·gen·ic (hī'pō-āl'ər-jěn'ĭk)
Having a decreased tendency to provoke an allergic reaction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There are a number of breeds that are hypoallergenic.
These come with beefed up air scrubbers, special coatings on all surfaces, and
  hypoallergenic everything.
Soon, hypoallergenic felines-cats that have little likelihood of causing an
  allergic reaction in humans-will be available.
Purchase water-based theatrical face paint that is non-toxic and hypoallergenic
  to create scary faces.
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