Birch & Wintergreen Cautions

Topically applied Birch oil and Wintergreen oil, which are both high in methyl salicylate, can potentiate the anticoagulant effect of warfarin, causing side effects such as internal hemorrhage. Similar effect may be possible with other anticoagulant drugs.
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Contraindicated for those facing major surgery, hemophilia, other bleeding disorders. Pregnancy, breastfeeding, young children. People with salicylate sensitivity (often applies in ADD/ADHD).
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Numerous cases of poisoning have been reported from ingesting Wintergreen oil; 4 to 8 ml is considered a lethal dose for a child. Methyl salicylate can be absorbed trans-dermally in sufficient quantities to cause poisoning in humans.
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Do not take Birch or Wintergreen internally.
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Do not use Birch or Wintergreen topically.
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Only use organic Birch or Wintergreen as these oils are commonly unadulterated.
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The use of Birch or Wintergreen should be limited to blends that have been formulated by a qualified Aromatherapist.
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Please note, all known Birch Essential Oil currently in the marketplace is a 'nature like' product.