The potential side effects from using Instaflex Joint Support are allergic reactions and digestive problems such as vomiting and nausea, according to SupplementCritic.com. One of the ingredients in the product, turmeric, lowers blood sugar, so diabetics should consult a doctor before use.
An eight-week randomized study published by Nutrition Journal found no adverse effects from Instaflex Joint Support, reports PubMed Central. The same study found that the product reduced joint pain and bettered the participants' performance in daily activities. The ingredients of Instaflex Joint Support are shown to be effective by scientific studies, but the product is expensive, states SupplementCritic.com.