Probably why it's best to read labels and not eat toothpaste, but most importantly, not to inject it into the blood stream:
https://pubmed.ncbi.nlm.nih.gov/31526095/
“Probably why it’s best to read labels and not eat toothpaste, but most importantly, not to inject it into the blood stream:”
Best you read ALL of your linked article! Note that a COVID injection contains only 0.05 mg.
“Nevertheless, it can be used as a solvent for repeated i.p. injections in mice at a dose of 2 mL/kg (i.e. 2.25 g/kg) without obvious signs of systemic toxicity.”