In the past, a relative could warn you not to consume stock cubes or seasonings. Indeed, according to a WhatsApp message, they contain a high percentage of glutamate potassium which can affect the heart and cause chronic diseases.

Truly, many stock cubes and seasonings contain monosodium glutamate (E621), not glutamate potassium. They also contain disodium inosinate (E631) and disodium guanylate (E627)

According to some global health reports and articles from dieticians and nutritionists on internet, those substances are harmful. They can destroy neurons, amplify headaches, disrupt the appetite, cause skin allergies, irritate the membranes or cause asthma.   

E621 and E627 particularly are the substances to avoid. In the European Union, they are approved for consumption but producers must respect a dosage.  It is also advised not to overuse products which contain those substances.

To avoid any problem, it is required to check the substances your seasoning contain before you buy them.