The Moderna COVID-19 Vaccine contains the following ingredients:

- messenger ribonucleic acid (mRNA)
- lipids (SM-102, polyethylene glycol [PEG] 2000 dimyristoyl glycerol [DMG], cholesterol, and 1,2-distearoyl-sn-glycero-3-phosphocholine [DSPC])
- tromethamine
- tromethamine hydrochloride
- acetic acid
- sodium acetate
- sucrose

Source: Moderna COVID-19 vaccine fact sheet (PDF from fda.gov)

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The Pfizer-BioNTech COVID-19 Vaccine includes the following ingredients:

- mRNA
- lipids ((4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyl)bis(2-hexyldecanoate), 2[(polyethylene glycol)-2000]-N,N-ditetradecylacetamide, 1,2-Distearoyl-sn-glycero-3-phosphocholine, and cholesterol)
- potassium chloride
- monobasic potassium phosphate
- sodium chloride
- dibasic sodium phosphate dihydrate
- sucrose

Source: Pfizer-BioNTech COVID-19 vaccine fact sheet (PDF from fda.gov)

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The Janssen (Johnson & Johnson) vaccine includes the following ingredients:

- recombinant
- replication-incompetent adenovirus type 26 expressing the SARS-CoV-2 spike protein
- citric acid
- monohydrate
- trisodium citrate dihydrate
- ethanol
- 2-hydroxypropyl-β-cyclodextrin (HBCD)
- polysorbate-80
- sodium chloride

Source: Janssen COVID-19 Vaccine EUA Fact Sheet (PDF from fda.gov)

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The AstraZeneca vaccine includes the following ingredients:

- ChAdOx1-S Recombinant
- Replication-deficient chimpanzee adenovirus vector encoding the SARS-CoV-2 Spike glycoprotein
- L-histidine
- L-histidine hydrochloride monohydrate
- magnesium chloride hexahydrate
- polysorbate 80
- ethanol
- sucrose
- sodium chloride
- disodium edetate dihydrate
- water for injections

Source: COVID-19 Vaccine AstraZeneca UK (PDF from service.gov.uk)