Benefits
Postpartum mood, bonding and fatigue after taking placenta capsules
In a randomized, double-blind, placebo-controlled pilot trial, 27 new mothers took capsules of their own steamed, dehydrated placenta or a look-alike placebo. Validated scales showed no significant differences between groups in mood, maternal bonding or fatigue. The researchers called the result preliminary given the small size, but it gives no support to the main reason women try placenta capsules.
Iron status after birth compared with a beef placebo
In a double-blind pilot trial of 23 healthy women, placenta capsules did not change hemoglobin, ferritin or transferrin over the first 3 weeks after birth compared with capsules of beef. Placenta capsules did contain more iron than the beef, but at the study's top intake they supplied only about a quarter of the daily iron needed while breastfeeding.
Hormone levels and prolactin in women taking placenta capsules
Hormones survive processing in measurable amounts, but in placebo-controlled pilot trials salivary hormone levels did not differ between the placenta and placebo groups, and plasma prolactin, the hormone that drives milk production, did not differ either. Newborn weight gain over the first 3 weeks did not differ significantly either.
Mood and energy in larger observational comparisons
In 138 Canadian women with a history of mood disorders, those who ate their placenta did not differ from matched women who did not in depression screening scores, energy, vitamin B12 levels or lactation-drug use. In US records of 3,752 matched mothers, placenta consumers scored slightly higher on a postpartum depression screen, which the authors suspect reflects who chooses the practice.
Porcine placental extract and symptom scores in women at midlife
Animal placenta extracts are a different product from a mother's own placenta. In 50 Japanese women, 300 mg/day of porcine extract for 12 weeks improved a menopausal symptom score more than placebo, while estradiol and FSH did not improve in either group. In a trial of 100 Korean women, 400 mg/day did no better than placebo on the main symptom score, so the two small trials disagree.
Mechanism of action
Hormones present after processing, at reduced levels
Laboratory analysis of 28 placentas prepared for encapsulation detected 16 of the 17 hormones measured. A separate study found that steaming and dehydration significantly lowered CRH, placental lactogen, oxytocin, ACTH and estrogen-like activity compared with raw tissue. Content alone does not show an effect, and the placebo-controlled trials found no significant between-group difference in salivary hormones or prolactin.
Small amounts of iron and trace minerals
At a commonly recommended intake of 3,300 mg/day, processed placenta supplied on average about 24% of the lactation RDA for iron, 7.1% for selenium, 1.5% for zinc and 1.4% for copper. Arsenic, cadmium, lead, mercury and uranium were also detected, at levels well below toxicity thresholds.
Home-style processing is not a validated sterilization step
No standards exist for processing placenta to eat. In the CDC case, the company's stated drying range was 115 to 160 degrees F, and investigators judged the heating may not have been enough to kill group B Streptococcus. Laboratory work shows heat processing lowers bacterial counts, and in one study all 24 processed samples were free of GBS, but a single contaminated batch can still reach a mother and her baby.
Clinical trials
Randomized, double-blind, placebo-controlled pilot trial of each woman's own steamed, dehydrated, encapsulated placenta versus a similarly prepared placebo, with validated mood, bonding and fatigue scales at four time points in late pregnancy and the early weeks after birth. (Young et al. 2018, Women Birth)
27 women in a US university study (12 placenta, 15 placebo).
Null result: no significant main effects on mood, bonding or fatigue between the placenta and placebo groups. The authors saw some time-point differences, including fewer depressive symptoms within the placenta group and less fatigue at the end of the study, but state these should not be interpreted as statistically significant and describe the findings as preliminary.
Randomized, double-blind, placebo-controlled pilot trial measuring salivary hormones by mass spectrometry in late pregnancy and early postpartum, alongside hormone analysis of each woman's capsules. (Young et al. 2018, Women Birth)
27 women (12 placenta, 15 placebo); companion paper to the mood trial.
Null result between groups: there were no significant differences in salivary hormone levels after supplementation that had not existed beforehand. Within the placenta group, salivary levels of the 15 detected hormones tracked how much of each hormone was in that woman's capsules, but the changes were too small to separate the groups.
Randomized, double-blind, placebo-controlled pilot trial comparing encapsulated placenta with encapsulated beef, measuring hemoglobin, ferritin and transferrin at 4 time points from week 36 of pregnancy to week 3 after birth. (Gryder et al. 2017, J Midwifery Womens Health)
23 healthy women with normal pregnancies (10 placenta, 13 beef placebo); 78% had hemoglobin above the WHO cutoff for gestational iron deficiency at week 36.
Null result: no significant differences in hemoglobin (P = .603), ferritin (P = .852) or transferrin (P = .936). Placenta capsules held about 0.664 mg iron per gram versus 0.093 mg/g in beef capsules, but the study's maximum daily intake supplied only 24% of the RDA for lactating women.
Randomized, double-blind, placebo-controlled pilot trial testing the claim that placenta capsules raise prolactin and support milk supply; plasma prolactin was measured 4 times and newborn weight 3 times. (Young et al. 2019, J Midwifery Womens Health)
27 women (12 placenta, 15 placebo) and their newborns.
Null result: no statistically significant differences in maternal plasma prolactin or newborn weight gain over the first 3 weeks after birth.
Multicenter, randomized, double-blind, placebo-controlled, parallel-group trial of an oral porcine placental extract, not human placenta, at 300 mg/day for 12 weeks. (Kitanohara et al. 2017, Climacteric)
50 Japanese women with mild menopausal symptoms, randomized 1:1.
The total Simplified Menopausal Index improved more on the extract than on placebo (p = 0.031), while serum estradiol and FSH did not improve in either group, so the authors say any effect was on how women felt rather than on hormone balance. No adverse events were observed. Two of the six authors were affiliated with a company, Snowden Co., Ltd.
Multicenter, randomized, double-blind, placebo-controlled trial of oral porcine placental extract at 400 mg/day for 12 weeks, scored with the Kupperman Index. (Lee et al. 2020, Taiwan J Obstet Gynecol)
100 Korean women after menopause.
Null main result: the Kupperman Index fell in both groups and the difference between them was not statistically significant. Larger drops on the extract were reported only in subgroups (BMI 23 or higher, and women within 3 years of menopause), which are secondary findings that need confirmation. Estradiol rose in the extract group.