Vaccine Ingredients & Excipients
Are vaccine ingredients, adjuvants, and preservatives safe?
An excipient is an inactive substance that serves as the vehicle or medium for a drug or other active substance. Excipients are things like coloring agents, preservatives, and fillers.
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While you can refer to package inserts for some detail on ingredients and possible contraindications, the CDC's list of Vaccine Excipients by Vaccine Name will detail the amount of ingredients per dose and its purpose. Please refer to VaccineSafety.edu for the most up-to-date materials on vaccine excipients.
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Here are a few concerning ingredients we saw in the most recent list, updated in December 2024:
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Formaldehyde
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Glutaraldehyde
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Polysorbate 80
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Thimerosal
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DNA
Some of these same chemicals are on the California's Proposition 65 list of chemicals that cause cancer.​
The list of "Vaccine Excipients by Vaccine Name" is from the CDC in partnership VaccineSafety.edu
Another compelling vaccine ingredient resource is this 2024 list from the Health Freedom Institute, that color codes various vaccine ingredients of concern.​
Preservatives
Prevent the growth of bacteria or fungus in vaccines.
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​Disinfectants These chemicals are used to inactivate the toxins and viruses in the vaccine.
Antibiotics
Used in production to prevent bacterial contamination during manufacturing.
Fertilizer
Chemicals used in fertilizers are also found in vaccines. They are used as “stabilizers” and preservatives, and as part of a process to determine effectiveness.
Aborted Fetal Cells
Cell lines are used to grow vaccines. It is possible that DNA from the “host” line remains in the final vaccine.
Could human DNA in vaccines cause cancer, brain damage?
Former pharmaceutical senior scientist, Hellen Ratajczak, explains that when DNA incorporates into a host DNA, it can result in ongoing inflammation that continues throughout the life of an individual.
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Vaccines that use or contain aborted fetal cells
Aborted fetal cells are sometimes used in the testing of vaccines while other manufacturers use fetal cells in the development process. When used in the development process, residual biological components from the fetal cells can be assimilated into the vaccines, including cell proteins and measurable portions of fetal DNA.
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To our current knowledge (Nov 2025), there are no COVID-19 vaccines being tested or manufactured that do not use fetal cell lines from aborted infants. For more information, visit cogforlife.org/guidance
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