. Toxic Heavy Metal Poisoning, Contamination, Symptoms, Testing, Chelation and Detox Protocols. . These effects usually last only a few moments. . Mouth ulcers A metallic taste Excessive salivation A loss of the sense of taste A burning, red, inflamed mouth 'Bald' patches on the tongue or cheeks (includes geographical tongue) and. Premature ventricular contractions (PVCs) are a type of abnormal heartbeat. "Patients typically describe altered taste sensation as a metallic or salty taste or an abnormal response to sweets," Rees says. Environmental Sensitivities. Natasha Bhuyan, MD, an evidence. "Commonly, vitamin supplements that contain iron, chromium, calcium and zinc cause a metallic taste in the mouth," she says.