What did @valerieribon actually say?
Valerie laid out a five-part routine she credits with raising progesterone naturally. The claims range from plausible nutrition advice to genuinely eyebrow-raising. She said "you can increase your progesterone by up to 77% just by having 750 mg of vitamin C," warned against polyester clothing citing a dog study where "75% of them could not get pregnant," and recommended grass-fed liver, egg yolks, and daily raw carrot salads. She also said synthetic vitamin C is "made with black molds," which is a claim that deserves its own unpacking. Progesterone is a real hormone with real effects on mood, skin, and cycle health, so it is worth taking these claims seriously rather than dismissing them outright.
Does the science back this up?
Partially, but the strongest claims are the weakest on evidence. The vitamin C and progesterone connection has some actual research behind it. A 2003 study by Henmi et al. published in Fertility and Sterility found that 750 mg of ascorbic acid daily raised serum progesterone levels in women with luteal phase defects, with some participants showing notable improvements. The 77% figure appears to come from this or a similar small trial. That matters: these were women with documented deficiency, not generally healthy people. The effect is not guaranteed to replicate in everyone.
The polyester claim draws on older animal research, likely studies from the 1990s involving scrotal polyester pouches in dogs and rats, which did show hormonal disruption. Extrapolating that to wearing a polyester blouse is a stretch the data does not support. The mechanism in those studies involved localized heat and static electricity at the testes, not systemic hormonal absorption through skin contact during normal wear.
Liver and egg yolks for cholesterol and B6? Genuinely solid advice. Progesterone biosynthesis does require cholesterol as a precursor, and B6 plays a role in corpus luteum function. Raw carrot fiber binding to estrogen in the gut has been discussed in functional medicine circles, though peer-reviewed evidence for the "carrot salad detox" specifically is thin.
What did they get wrong (or right)?
The synthetic vitamin C claim is flat-out wrong and should not go unchallenged. Ascorbic acid, whether "synthetic" or from acerola cherries, is chemically identical: C6H8O6. The "made with black mold" framing refers to the Reichstein process, which uses bacterial fermentation of glucose, not Aspergillus mold contamination. The end product is the same molecule regardless of manufacturing route. This is a common naturalistic fallacy dressed up in sciency language.
The polyester-progesterone connection is misleading in context. The dog studies are real but involved direct scrotal contact with polyester material designed to stay in place, not clothing. There is no human clinical evidence that wearing a polyester shirt meaningfully suppresses progesterone in women.
On the other hand, the liver recommendation is solid. Vitamin B6 deficiency is genuinely associated with luteal phase insufficiency, and grass-fed liver is one of the most nutrient-dense foods available. The egg yolk cholesterol point is also legitimate. Cholesterol is the backbone of all steroid hormones. Dietary cholesterol restriction is not a smart move if you are trying to support hormone production.
Calling progesterone "the beauty hormone" is a simplification, but progesterone does have documented effects on skin sebum, hair cycle, and mood regulation via GABA-A receptor activity, so there is something real underneath the marketing language.
What should you actually know?
Progesterone levels vary significantly across the menstrual cycle and decline sharply in perimenopause. If you are experiencing symptoms like irregular cycles, sleep disruption, anxiety, or hair thinning, those warrant a blood test, not a TikTok supplement stack. Serum progesterone is measurable and relatively inexpensive to test. The 750 mg vitamin C finding from Henmi et al. is interesting but came from a small sample of women with confirmed luteal phase defects. It is not a general prescription for everyone.
If you are postmenopausal or have a diagnosed progesterone deficiency, the evidence base for bioidentical progesterone (micronized progesterone, such as Prometrium) is substantially stronger than any of the dietary interventions discussed in this video. A telehealth provider can order the right labs and discuss options that are actually matched to your hormone levels rather than a one-size-fits-all wellness routine.
The broader lifestyle advice here, eating whole foods, prioritizing micronutrients, avoiding endocrine disruptors where reasonable, is not bad. But the specific mechanistic claims, especially the vitamin C percentage and the polyester fertility warning, are being presented with more certainty than the underlying evidence justifies.