I also work in health care.
The ingredients in vaccines are widely available.
Interim Clinical Considerations for Use of COVID-19 Vaccines | CDC
It's utter bullshit to say "no one knows"
Active ingredient Nucleoside-modified mRNA encoding the viral spike (S) glycoprotein of SARS-CoV-2
5–11 years (orange cap): 10 µg
12 years and older (gray cap): 30 µg
Nucleoside-modified mRNA encoding the viral spike (S) glycoprotein of SARS-CoV-2 (30 µg) Nucleoside-modified mRNA encoding the viral spike (S) glycoprotein of SARS-CoV-2 Recombinant, replication-incompetent Ad26 vector, encoding a stabilized variant of the SARS-CoV-2 Spike (S) protein
Inactive ingredients 2[(polyethylene glycol (PEG))-2000]-N,N-ditetradecylacetamide 2[(polyethylene glycol (PEG))-2000]-N,N-ditetradecylacetamide PEG2000-DMG:1,2-dimyristoyl-rac-glycerol, methoxypolyethylene glycol Polysorbate-80
1,2-distearoyl-sn-glycero-3-phosphocholine 1,2-distearoyl-sn-glycero-3-phosphocholine 1,2-distearoyl-sn-glycero-3-phosphocholine 2-hydroxypropyl-β-cyclodextrin
Cholesterol Cholesterol Cholesterol Citric acid monohydrate
(4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyl)bis(2-hexyldecanoate) (4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyl)bis(2-hexyldecanoate) SM-102:heptadecan-9-yl 8-((2-hydroxyethyl) (6-oxo-6-(undecyloxy) hexyl) amino) octanoate Trisodium citrate dihydrate
Tromethamine Sodium chloride Tromethamine Sodium chloride
Tromethamine hydrochloride Monobasic potassium phosphate Tromethamine hydrochloride Ethanol
Sucrose Potassium chloride Acetic acid
Dibasic sodium phosphate dihydrate Sodium acetate
Sucrose Sucrose