Milk Is Just Filtered Blood

Published on Apr 12, 2018
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Female mammals make milk, a cocktail of filtered blood, to provide their babies with vital nutrients.
Thanks also to our Patreon patrons and our US-tv sponsors.
To learn more, start your googling with these keywords:
Mammal: Endothermic vertebrates that nurse their young.
Lactation: The secretion of milk by the mammary glands.
Mammary Gland: A cluster of alveoli and ducts that secretes milk.
Mammary Alveoli: The tiny sacs that are the site of milk production and storage in the mammary gland.
Oxytocin: A hormone released by the pituitary gland that - among other things - causes the milk ejection reflex during nursing.
Holstein: A large black and white cow known for the large quantities of milk it yields.

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Credits (and Twitter handles):
Script Writer: David Goldenberg (@dgoldenberg)
Script Editor: Emily Elert (@eelert)
Video Illustrator: Qingyang Chen (@QCVisual)
Video Director: David Goldenberg (@dgoldenberg)
Video Narrator: Emily Elert (@eelert)
With Contributions From: Henry Reich, Alex Reich, Kate Yoshida, Ever Salazar, Peter Reich
Music by: Nathaniel Schroeder:

Skibiel, A., Downing, L., Orr, T., and Hood, W. (2013).The Evolution Of The Nutrient Composition Of Mammalian Milks. Journal of Animal Ecology. 82 (6): 1254-1264. Retrieved from:
Sharp, J., Wanyonyi, S., Modepalli, V., Watt, A., Kuruppath, S., Hinds, L., Kumar, A., Abud, H., Lefevre, C., and Nicholas, K. (2017). The Tammar Wallaby: A Marsupial Model To Examine The Timed Delivery And Role Of Bioactives In Milk. General and Comparative Endocrinology. 244: 164-177. Retrieved from:
Tsuruta, S., Misztal, I., and Lawlor, T. (2004). Genetic Correlations Among Production, Body Size, Udder,and Productive Life Traits Over Time in Holsteins. Journal of Dairy Science. 87(5):1457-1468. Retrieved from:
Nicholas, K. (1988). Asynchronous Dual Lactation In A Marsupial, The Tammar Wallaby. Biochemical and Biophysical Research Communications. 154 (2): 529-536. Retrieved from:


  • Hi there - we appreciate that the “just filtered” part of our title has drawn a few comments and we want to address it. First off - you’re right; you could say lots of things are filtered blood products, including urine and even the carbon dioxide we breathe out. We decided to make this video because we believe most people, including ourselves, don’t think about how the same thing is true for a substance a lot of us drink every day - milk from an animal - and that communicating that fact would lead folks to a different appreciation of what milk is. Secondly - you’re also right; we didn’t fully convey the amazing things that the mammary gland does. Almost all of the precursors to the stuff in milk DO come from the bloodstream, but the special cells in the mammary gland transform many of them into their final milky forms, which we simplified in the video as “do some chemistry on them” and in the title as “filtered.”

    • In other words, you oversimplified to the point that it's no longer correct and misleading. Manslaughterers can be called killers too. So are murderers and serial killers, but let's all just simplify them to killers right?

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    • Blaze the Dragon so they have to use WRONG terminology? It's not filtered blood...

    • Sebastian Elytron it's not pedantic at all... they are oversimplifying and sensationalizing it. And using the wrong terminology.

  • Dont have a cow, man!

  • Well... bye bye cereal...

  • So do human mothers filter blood to produce milk for their babies?


  • "Milch is Gift"

  • I wonder how Jehovah Witnesses' react to this video. If you belong to that faith please let me know.

  • So glad I don’t drink cow milk

  • Bitch, don’t you mean titty juice?

  • This is disgusting I wish I never watched it.

  • Where the fuck do u think it comes from

  • No wonder I love milk

  • . . . *puts down my cereal*

  • lie so bigest lie

  • Vegan! 🙌

  • It's some tasty blood!

  • What badge

  • so why blood is not drinkable and you can drink milk? f**k logic

  • "Moo-Yah!" XD

  • So does that mean I put blood in my cereal

  • Aww crap


  • It's nothing new really, for people overreacting over this

  • Well it taste good. So i dont care

  • I always like to drink the blood of my enemies 😛


  • Kill Me

  • Mmm... yummy filtered cow blood.

  • That’s why vampires use milk as a blood substitute

  • 1:21 is adorable i mean look at that bunnyies face!

  • I am never drinking milk again

  • No wonder I like milk so much

  • I might sponser since i live science and your. Videos

  • Yeah drinking milk is weird.. it’s like this. Think of it like the opposite. Cows drink our mothers milk. That’s weird. But WE drink out of a cow mothers milk.

  • Oh god Noo

  • Okay

  • thats almost cannibalism just add some organs and thats where it goes a bit wrong


  • You can let any food sound disgusting somehow. Disgust is just a safety mechanism and as long as it doesnt prevent you from dangers its completly pointless. So stop trying to achieve disgust and only show the part in which you explain why milk is not really healthy.

  • Fuck u m8... you ruined my fravorite drink bitch

  • I better stop drinking milk so my bones will turn into powder xdxd

  • Can I say I have blood for breakfast now?

  • *stares at video and continues to drink milk in hand*

  • So did I drink blood from my mom’s milk!!?!?!?

  • Yeah. Knew that. I clicked on the video just to see other people’s reaction lmao

  • I’ve been drinking milk since I was born.......... “Mom can I drink orange juice now?”

  • WHAT ARE YOU TRYING TO SAY? That means human babies drink "filtered human blood"? Milk is milk and blood is blood. Please... don't mix them

  • My doc told me that i can't drink milk

  • Ummm I guess 🤷🏼‍♀️

  • Honey is just filtered bee vomit.

  • I'm drinking milk rn.. :'/

  • I was about to eat breakfast

  • unbelievable

  • the fuck

  • so im eating sour blood rn if u get what i mean

  • Can we get a video about what products a mammalian body makes that are NOT "filtered blood?"

  • Some people just want to watch the world burn...

  • *what if Dracula had vegetarian daughter?*

  • Oh that's why I enjoy drinking it so much.

  • 😲😲😲😨😨😨●︿●

  • WTF!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  • I guess it's time to skip the middleman and go strait for the blood! :3

  • Teets

  • Nah not drinking milk anymore

  • is sperm blood too?

  • So this is why vegans keep saying "MILK IS ANIMAL CRUELTY"

  • Don’t feel like going to Costco anymore...

  • milk is not blood, it gets the nutrients from the blood.

  • That cow at the end need some milk

  • This is fake

  • Why iam I watching this while drinking milk????

  • *t e e t*

  • Vampires do no exis-

  • 😵😵😵😵🍼🍼🍼🍼🍼why milk? Wait we dip cookies in blood!? I will never drink milk again!! Wait kittens drink blood I am done with life!!😩😩😩😩😩😭😭😭why did I watch this video

  • Ok we are vampires

  • But I love milk!!!!!

  • What. The... FUCK?!


  • If a vampire attacked me I would show him or her this vid

  • :( i love milk now i dont know

  • Make a video about Feudalism.

  • Oh my goldnes

  • Great now I’m going feel sad when eat ice cream thanks 😒


  • (No wonder why they are so delicious.. blood hm?)

  • This is why I just drink a glass of ice-cold cow's blood every morning... All the wholesome goodness of milk plus iron. 😋😃

  • powdered milk

  • Ah no wonder I love milk so much pairing it up with my vampire wants makes sense

  • So I wasn't crazy for never liking milk because I thought it tasted like blood.

  • Udderly

  • *oh boy the vegans*

  • idfc i drink cow blood i drink my own blood from wounds and i bet at some point you did that too heh...

  • I will not drink milk for a month after watching this video.

  • If you put juice on milk

  • Im never drinking milk ever again

  • Milk is not made of blood, you get it from cows

  • I thought people knew that...

  • Never thought about that and it is pretty cool. Keep the good job 🖖

  • I'm still drinking milk tho...

  • yay?