City of Toronto. Structural engineer (P.Eng.) with more than 20 yearsâ experience in wood, masonry, concrete and steel design for residential, industrial and commercial buildings. Licensed and fully insured.
Let us look at the allergic reactions to Psyllium husk. They are as follows: 1  Breathlessness. 2  Sneezing and flu symptoms. 3  Itches. 4  Rash and even hives. 5  Swelling.
Common Side Effects. Like any fiber supplement, Metamucil can cause gas and bloating, according to UMMC. Its psyllium content may also cause stomach pain, nausea, vomiting and diarrhea.