The largest human milk vesicle study to date, 364 mothers in the Faroe Islands. 1,523 microRNAs were detected in at least 70% of samples, and their levels tracked with time since birth, maternal body mass index and smoking, but not with how many children a mother had.
the research library exosomes everywhere
vesicles in pregnancy and breastfeeding
A mother and her baby are talking long before the first word.
If you want to know whether vesicles carry real biological information between two people, pregnancy and breastfeeding are where to look, because it happens in every healthy pregnancy whether or not anyone sells a product for it. This is also the only vesicle page here with a human cohort in the hundreds.
a gentle note
This page describes what researchers have measured in pregnancy and in milk. It is not a verdict on how anyone feeds a baby, and it is not medical advice. Your OB, midwife or lactation consultant knows your story.
12papers
11studies in people
4counterpoints
this page, by tier
- 1 human evidence
- 10 early human
- 1 lab + animal
- 0 background
the short version
what the research found
the headline numbers
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Pregnant women had more than 50 times the blood exosome concentration of women who were not pregnant, and it more than doubled across pregnancy.
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Placental vesicle signal in a mother's blood climbed through the first trimester, from 70.6 pg/mL at 6 weeks to 117.5 pg/mL at 12 weeks.
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Breast milk exosomes were most concentrated in colostrum, at a median of 1.62 × 10⁸ particles per mL, and fell significantly after two weeks.
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In 364 mothers, 1,523 milk vesicle microRNAs were detected in most samples, and their levels tracked with time since birth, body mass index and smoking.
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No microRNA was detectable in the infant formulas tested, and the vesicle-sized particles in them looked like casein micelles.
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Holder pasteurization of donor milk kept particle numbers steady but lowered 8 of the 13 vesicle microRNAs measured.
the nano angle
Placental vesicles in a mother's blood and milk vesicles in a baby's gut are the two best documented examples of vesicle signaling between two people, and both are measured with the same particle methods used for food vesicles.
my honest bottom line
Placental vesicles rise across a healthy pregnancy and milk vesicles are most concentrated in colostrum, and both can be measured reliably enough to track. The limit I hold onto is the math: on average there is far less than one copy of any given microRNA per vesicle, so the cargo story needs better evidence than particle counts.
evidence at a glance
12 papers
- human evidence1
- early human10
- lab + animal1
- backgroundnone yet0
Includes 5 nano-angle papers and 4 counterpoints.
every title links to the original
the papers
Sorted from the strongest human evidence down to the lab work and background reading. Counterpoints are marked, and they stay in on purpose.
Donor milk from six mothers was Holder pasteurized at 62.5 °C for 30 minutes. Particle numbers held steady, but vesicle shape and size changed and 8 of 13 vesicle microRNAs went down, while the fat and serum fractions were largely unaffected.
Seventeen mothers of preterm babies were followed for 48 weeks. Exosomes were most concentrated in colostrum, a median of 1.62 × 10⁸ particles per mL, and fell significantly after two weeks. Levels did not track with birth order, delivery type, maternal age or how early the baby came.
Human milk kept at 4 °C for four weeks held on to only about half its exosome-sized vesicles (49 ± 13%). In the infant formulas tested, no microRNA was detectable, and the vesicle-sized particles appeared to be casein micelles.
Milk exosomes from mothers of preterm babies survived simulated digestion and entered intestinal cells. Of 330 microRNAs identified, the most abundant matched term milk, and 21 low-level ones were found only in preterm milk.
Across 24 milk samples from early to late lactation, 288 mature microRNAs were found, with miR-22-3p the most abundant. Overall levels held steady through simulated stomach and pancreatic digestion, and digested vesicles still entered human intestinal cells.
show all 12 papersshow fewer
Placental exosomes rose across pregnancy in both groups but ran about 1.5 to 2.2 times higher in gestational diabetes, and those exosomes pushed blood vessel cells to release more inflammatory signals. More vesicles is not the same as better.
Blood exosome levels were more than 50 times higher in pregnant than non-pregnant women and more than doubled across pregnancy. Exosomes from each trimester made blood vessel cells migrate 1.9, 1.6 and 1.3 times more, so these particles are active, not debris.
Ten women gave blood every week from 6 to 12 weeks of pregnancy, 70 samples in all. Placental exosome signal rose steadily from 70.6 to 117.5 pg/mL, and the week of pregnancy explained more than 70% of the change in placental signal but only 20% of total exosome number.
How many vesicles you recover from breast milk depends on how the milk was collected, stored and processed. The team also found lipid tubules nobody had described before. Any milk vesicle count should be read alongside its method.
Vesicles in human colostrum and mature milk had the density of exosomes and carried immune markers including MHC class I and II, CD63, CD81 and CD86. This is the paper that established that human milk contains immune-active vesicles.
Counting exosomes and microRNA molecules in the same samples gave an average of 0.00825 microRNA molecules per exosome. Even for the most abundant microRNA, you would need to look at more than 100 exosomes to find a single copy.
keep reading
more from the library
food, supplements and pregnancy pregnancy, first trimester and beyond Progesterone trials from PROMISE to PROLONG, and the prenatal nutrients with real trial data. exosomes everywhere the high-EV diet Which foods carry vesicles, what cooking and drying do to them, and what happens after you eat them. exosomes everywhere vesicles and the gut The gut lining makes its own vesicles. How they talk with food, bacteria and the immune system.
This page summarizes published research for education. It is not medical advice, and nothing here describes what any nanonourish™ product does. Talk with your care provider before changing your diet or starting a supplement, especially if you are pregnant, nursing or taking medication. Summaries by Dr. Kaylan Jackson, PhD, a chemist, not a physician. Citations checked against PubMed and Crossref, September 2026.