Myth: Vaccine ingredients like formaldehyde and aluminum are toxic

Vaccine Ingredients: Context Matters

### Formaldehyde in Vaccines

**Amount**: 0.02-0.04 mg per dose (inactivated vaccines only, not live vaccines)

**Your body**: Produces 40-50 mg/day naturally as a byproduct of metabolism

**Processed out**: Diluted to trace amounts during manufacturing

**Toxicity study**: Formaldehyde causes cancer at 15+ ppm in air; vaccine amounts are ng/mL

### Aluminum in Vaccines

**Amount**: 0.125-0.5 mg per dose

**Your diet**: Unvaccinated children get 100-500 mg/day from food (breast milk, formula, vegetables)

**FDA limit**: 0.125 mg/kg/day IV — vaccines are far below this even for infants

**Function**: Adjuvant that helps immune system recognize vaccine

### Thimerosal Myth Already Covered Above

See "mercury-thimerosal-autism" — modern US vaccines don't contain it.

### Other Ingredients (Gelatin, Yeast, Antibiotics)

**Gelatin**: From animals; used to stabilize vaccine

**Yeast proteins**: From manufacturing process, trace amounts

**Antibiotics** (neomycin, gentamicin): Kill bacteria during manufacturing; removed before final product

**None exceed toxic levels**

### Extreme Case: Are Some People Allergic?

Yes, severe allergies to gelatin or specific proteins are rare (~1 in 1 million). These people get alternatives or different vaccines. This is why we ask about allergies pre-vaccination.

📚 Research Sources

Mitkus RJ, King DB, Hess MA, Forshee RA, Walderhaug M (2011)

"Updated aluminum pharmacokinetics following infant exposures"

Vaccine

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Vaccine ingredients are used in safe, studied amounts. Formaldehyde is present naturally in your body; aluminum amounts are far below toxic levels.

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Vaccine Ingredients: Context Matters

📚 Research Sources

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