This in addition to the Tris buffer that was changed in the pediatric Rona jab. The companies and the fact checkers claim the Tris was added to extend the shelf life of the vaxxines by slowing the breakdown of the biologics - at least that is what the press releases claim. However, Tris can also be used in an attempt to help reduce heart attacks. If this is simply to stabilize the shelf life of the jab, why not have it in adult doses? Tromethamine (Tris) is a blood acid reducer used to stabilize people with heart attacks. Here are known side effects: Respiratory depression, local irritation, tissue inflammation, injection site infection, febrile response, chemical phlebitis, venospasm (vein spasms), hypervolemia, IV thrombosis, extravasation (with possible necrosis and sloughing of tissues), transient decreases in blood glucose concentrations, hypoglycemia, and hepatocellular necrosis with infusion via low-lying umbilical venous catheters