Dietary Supplement. Strengthens Natural Resistance. Soothes Common Symptoms. Elderberry & Garlic. Herbal IQ™ Guarantee Strengthens the Body s Natural Resistance with European elder, echinacea & key nutrients, plus soothing herbs to ease common symptoms, including forsythia, chrysanthemum & ginger.*. Herbal IQ Guarantee Our comprehensive Herbal IQ Guarantee program ensures thorough review by qualified herbalists of selected herbs & combinations, research-based potencies, & identity verification & purity testing of all inbound materials at our GMP-compliant, USA-ba.