07/15/2026
Facts about Vitamin K & why we give it in a shot to newborns-
A Series
Anti-Vitamin K-er: “Vitamin K is not even a vitamin! You are absolutely disgusting!”
Facts:
🔬 WHAT IS VITAMIN K?
Vitamin K is a fat-soluble vitamin discovered in 1929 by Danish scientist Henrik Dam during experiments on cholesterol metabolism. He noticed that chickens on certain diets developed uncontrollable bleeding. He identified the missing nutrient and named it "K" for "Koagulation," the Danish and German word for coagulation (blood clotting).
In 1943, Dam and American biochemist Edward Doisy were awarded the Nobel Prize in Physiology or Medicine for discovering and isolating vitamin K.
That is not a vaccine origin story. That is a vitamin origin story.
🥬 WHERE IS VITAMIN K FOUND NATURALLY?
Vitamin K1 (phylloquinone) is found in everyday foods:
Kale: ~565 mcg per 100g
Spinach: ~255 mcg per 100g
Broccoli and Brussels sprouts: ~150-195 mcg per 100g
Olive oil, soybean oil, canola oil
Cabbage, lettuce, parsley
Vitamin K2 (menaquinone) is produced by bacteria in your gut and found in fermented foods, dairy, meat, and eggs.
You eat vitamin K every single day. It is a nutrient, not a pharmaceutical invention.
💉 SO WHAT IS IN THE NEWBORN SHOT?
The molecule in the shot is called phytonadione. The FDA classifies it as a "vitamin K replacement." Its mechanism of action section on the FDA label reads:
"Phytonadione possesses the same type and degree of activity as does naturally-occurring vitamin K, which is necessary for the production via the liver of active prothrombin (factor II), proconvertin (factor VII), plasma thromboplastin component (factor IX), and Stuart factor (factor X)."
Read that again: "the same type and degree of activity as does naturally-occurring vitamin K."
It is the same molecule. It does the same thing. It helps the liver make clotting factors so blood can clot.
❌ "BUT IT'S SYNTHETIC, SO IT'S NOT REALLY A VITAMIN"
Many vitamins you take every day are synthesized in a lab. Your prenatal vitamin? Synthetic folic acid. Your vitamin D supplement? Synthetic cholecalciferol. Your vitamin B12 shot? Synthetic cyanocobalamin. The vitamin C in your orange juice that says "fortified"? Synthetic ascorbic acid.
"Synthetic" means it was manufactured rather than extracted from a plant. It does not mean it is a different molecule. Phytonadione IS vitamin K1. The body cannot tell the difference because there is no difference at the molecular level.
🧬 HOW DOES IT WORK?
Vitamin K serves as an essential cofactor for an enzyme in the liver that activates clotting factors II, VII, IX, and X through a process called gamma-carboxylation. Without enough vitamin K, those clotting factors sit in the liver in an inactive form and blood cannot clot properly.
This has absolutely nothing to do with the immune system. There are no antibodies involved. No immune memory is created. No pathogen is targeted. It is a nutrient that enables a biochemical reaction in the liver. Period.
🆚 VITAMIN vs. VACCINE: THE ACTUAL DIFFERENCE
A VACCINE stimulates the immune system to recognize and fight a specific germ by producing antibodies or activating immune cells.
A VITAMIN is a nutrient the body needs in small amounts for normal biological functions but cannot produce in sufficient quantities on its own.
Vitamin K does not interact with the immune system. It activates clotting proteins. That is why it is classified as a vitamin, not a vaccine. The FDA, the AAP, the WHO, and every pharmacology textbook on earth classify it as a vitamin.
💡 WHY IS IT GIVEN BY INJECTION?
Because the route of delivery does not change what a substance is.
Insulin is injected. It is a hormone, not a vaccine.
Epinephrine (EpiPen) is injected. It is a medication, not a vaccine.
Vitamin B12 is injected. It is a vitamin, not a vaccine.
Iron infusions are given by IV. Iron is a mineral, not a vaccine.
Vitamin K is given by injection to newborns because their immature guts do not absorb it reliably enough by mouth to guarantee protection against bleeding. The injection ensures 100% of the dose reaches the bloodstream.
📊 THE BOTTOM LINE
Vitamin K was discovered as a vitamin in 1929. It won a Nobel Prize as a vitamin in 1943. It is found in spinach, kale, broccoli, and olive oil. The FDA classifies the newborn shot as a "vitamin K replacement." It works by activating clotting factors in the liver. It has zero interaction with the immune system.
Calling it "not a vitamin" does not make it not a vitamin. The chemistry, the biology, the pharmacology, and nearly a century of science all say the same thing: it is a vitamin.
Your baby is not born broken. But your baby IS born with very low levels of this essential nutrient because it barely crosses the placenta, breast milk contains very little of it, and newborn guts lack the bacteria to produce it. One shot fixes that. That is not poison. That is nutrition.
https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=1add4de5-0f9c-453e-9dd5-abb8077b566a
