The science
behind the science.
Every ingredient. Every form. Every dose. Traceable to peer-reviewed human research. This is the long version — for the readers who want to verify before they trust.
How we built the formula.
Soothe+ wasn't formulated by stitching together ingredients that sound good. It was built backward — from six biological drivers, to mechanism, to clinically-validated form, to dose. Three principles governed every decision.
We started with the biology, not the marketing. Each ingredient must address a documented pathway in perimenopausal pruritus — mast cell stabilization, TRPV1 desensitization, ceramide replenishment, gut histamine reduction, estrogen metabolite balancing, or methylation-dependent clearance. If it doesn't earn a pathway, it doesn't make the formula.
Standard forms are insufficient when systemic absorption is the bottleneck. We selected enhanced forms — enzymatically modified isoquercitrin (17× quercetin), micronized PEA (10× standard), krill phospholipid omega-3 (2.5× fish oil), 5-MTHF over folic acid, P5P over pyridoxine — for clinically relevant tissue delivery. The ingredient name on the label is not the same as the form in the bottle.
Doses are matched to the studies that produced the documented effect — not to the minimum that fits a label claim, and never hidden inside a proprietary blend. Every milligram is disclosed on the Supplement Facts panel. If a study used 100mg, we use 100mg. If you can't see the dose, the dose isn't real.
Six drivers. Beneath the surface.
Perimenopausal pruritus is not a single pathology with a single fix. It is the surface output of six converging biological events, each operating on a different system, each demanding a different intervention. Here is the mechanism behind each — and exactly what Soothe+ does about it.
Mast cells throughout the dermis express estrogen receptors ERα and ERβ. Under physiological estrogen levels, ERβ signaling maintains an inhibitory tone on degranulation thresholds. As estrogen declines, this regulation diminishes — mast cells become hyperreactive to triggers that previously did not provoke a response. Heat, friction, certain foods, low-grade stress now trigger inappropriate release of histamine, tryptase, prostaglandin D2, and leukotrienes into the dermal microenvironment.
TRPV1 ion channels on peripheral C-fibers transduce noxious thermal and chemical signals — including itch. Estrogen modulates TRPV1 expression and threshold sensitivity; its decline lowers the activation threshold. The result is spontaneous, non-histaminergic itch — clinically described as "crawling," "tingling," or formication — which by definition is unresponsive to H1 antihistamines. This is the channel Zyrtec genuinely cannot reach.
The stratum corneum's integrity depends on intercellular lipid lamellae composed of ceramides, cholesterol, and free fatty acids. Estrogen positively regulates ceramide synthesis via stimulation of serine palmitoyltransferase and ceramide synthase, and drives sebum production via sebocyte stimulation. Their decline results in measurable ceramide depletion, increased transepidermal water loss, thinner epidermis, and direct exposure of cutaneous nerve endings to environmental triggers. No topical cream resolves this from the outside.
Intestinal histamine arises from bacterial decarboxylation of dietary histidine by histidine-decarboxylase-positive gut microbiota and from ingested histamine-rich foods. Diamine oxidase (DAO) — the enzyme that catabolizes intestinal histamine — becomes rate-limiting when load exceeds capacity. Excess histamine crosses the gut barrier (particularly with compromised tight junction integrity) and contributes to systemic burden. The gut quietly reloads the system every 24 hours. This is why upstream interventions alone don't hold.
Estrogen is metabolized via cytochrome P450 enzymes into two principal hydroxylated pathways: 2-hydroxyestrone (protective, weakly estrogenic) and 16α-hydroxyestrone (inflammatory, directly mast cell-activating). The 2:16 ratio between these metabolites varies between individuals based on diet, genetics, and microbiome. A skewed ratio toward 16α perpetuates mast cell reactivity even when total estrogen is low — which is why blood panels often read "normal" while the itch persists.
Tissue histamine is cleared intracellularly by histamine N-methyltransferase (HNMT), which requires S-adenosylmethionine (SAMe) as methyl donor. SAMe regeneration depends on the methylation cycle, which requires active folate (5-MTHF) and active B6 (P5P). 40–60% of the global population carries MTHFR C677T or A1298C polymorphisms that impair folic acid conversion to 5-MTHF. In these individuals, standard folic acid supplementation is essentially non-functional — the fire keeps burning because the exit is blocked.
Eleven ingredients. Each one earned.
For each active ingredient: the specific form chosen and why, the pathway it operates on, and the published study that justifies its inclusion at the dose used.
What's in the bottle. Verified.
Every lot of Soothe+ is tested for purity, identity, potency, contaminants, and microbial integrity before it ships. Manufacturing follows the same standards required of pharmaceutical-grade supplements.
Produced in a US-based, FDA-registered facility operating under current Good Manufacturing Practice regulations (21 CFR Part 111). Every batch follows pharmaceutical-grade quality protocols.
Independent laboratory verification for ingredient identity, label-claimed potency, microbial limits, and heavy metals. Certificates of Analysis available on request.
Pyrrolizidine alkaloids — the hepatotoxic compounds that caused generic butterbur to be withdrawn from several markets — are removed via supercritical CO₂ extraction and tested below detection limits in every lot.
Lead, cadmium, mercury, and arsenic tested in every lot. Limits below USP and California Prop 65 thresholds. Botanical ingredients are particularly screened given their soil-source variability.
Every milligram of every ingredient is disclosed on the Supplement Facts panel. If a brand hides doses behind a "proprietary blend," it's because the doses don't match the studies they cite.
Non-GMO, gluten-free, soy-free, dairy-free, and free from artificial colors, sweeteners, and preservatives. Vegetarian HPMC capsule shell — no gelatin.
The studies behind the formula.
Every active ingredient in Soothe+ is supported by published human research in peer-reviewed journals. Below are the principal studies behind each pathway.
Kawashima et al. — significant reduction in itch, wheal, and flare responses vs placebo. Bioavailability confirmed at 17× standard quercetin.
EMIQSchapowal A — Ze339 as effective as cetirizine 10mg for symptom reduction; significantly fewer side effects; no sedation; PA-free safety confirmed.
Butterbur Ze339Keppel Hesselink JM et al. — multiple studies confirm anti-neuroinflammatory effects via TRPV1 desensitization. Formication-specific mechanism documented.
Micronised PEAKoyama et al. — significant reduction in skin dryness and itch frequency vs placebo. Epidermal ceramide restoration confirmed via biopsy at endpoint.
Konjac CeramidesLarmo et al. — significantly improved skin hydration and reduced atopic dermatitis symptom severity in supplemented populations.
Sea Buckthorn OilLin et al. — 1,000mg/day omega-3 significantly decreased pro-inflammatory IL-6, improved skin hydration, and reduced validated pruritus scores.
Krill OilThomson CA et al. — women randomised to DIM showed sustained 2:16 ratio shift vs placebo. Adherence >91%. Urinary metabolites confirming absorption.
DIMOksaharju et al. — L. rhamnosus GG suppresses FcεRI and H4 histamine receptor expression on human mast cells, reducing baseline reactivity.
LGG ProbioticHagel et al. — double-blind crossover study confirming Vitamin C's direct histamine-degrading mechanism. Plasma histamine significantly lower vs placebo.
Vitamin CGreenberg et al. and global replications confirm MTHFR C677T and A1298C prevalence. Active 5-MTHF restores HNMT function where folic acid cannot.
MethylfolateP5P (pyridoxal-5-phosphate) demonstrates superior bioavailability vs pyridoxine HCl, particularly in individuals with hepatic conversion deficits.
Vitamin B6 (P5P)Multiple reviews document the prevalence (up to 78%) and persistence (mean 7+ years untreated) of perimenopausal pruritus, with mechanism mapped across estrogen-receptor-bearing tissues.
BackgroundFor the careful reader.
The questions we get from physicians, scientifically-trained customers, and women who don't take supplement claims at face value.
Soothe+ is hormone-free by design. Our hypothesis — supported by the literature — is that perimenopausal pruritus is not best treated by replacing estrogen, which carries known risks and contraindications, but by addressing the downstream consequences of estrogen decline at each affected biological system. This approach is appropriate for women across the entire perimenopausal-to-postmenopausal spectrum, including those for whom HRT is contraindicated.
Cetirizine is a peripheral H1 receptor antagonist. It addresses one of the six biological drivers — receptor-level histamine signaling — with documented efficacy. However, it does not stabilize mast cells upstream, does not block leukotriene-mediated itch (~30–40% of pruritic signaling), does not address neurogenic TRPV1-mediated formication, does not rebuild barrier integrity, does not modulate estrogen metabolism, and does not affect gut histamine load. Long-term cetirizine use is also associated with rebound pruritus on discontinuation — a well-documented withdrawal phenomenon in the dermatologic literature.
Soothe+ is not classified as an antihistamine. While certain ingredients have downstream antihistaminic effects (Butterbur Ze339, EMIQ), the majority of the formulation operates on entirely different pathways: TRPV1 desensitization, barrier rebuilding, gut microbiome modulation, hormonal metabolite balancing, and histamine clearance. The formula is designed for systemic, multi-pathway intervention — not receptor blockade.
Layer 1 ingredients (EMIQ, Butterbur, PEA) demonstrate effects within days to two weeks per the referenced clinical literature. Layer 2 (ceramide replenishment, omega-3 incorporation) builds across weeks 2–12. Layer 3 (DIM, LGG, methylation cofactors) operates on longer biological timescales — DIM produces measurable shifts in estrogen metabolite ratios by weeks 4–6; LGG-mediated microbiome changes typically build over 8–12 weeks. The 60-day guarantee window reflects this multi-phase pharmacodynamic profile.
Yes. Each ingredient dose is selected to align with the dose that produced the documented effect in its supporting clinical literature, within the formulation constraints of a daily two-capsule serving. The full Supplement Facts panel is disclosed — no proprietary blends. If a study used 100mg, we use 100mg.
There are no known pharmacokinetic interactions between Soothe+ ingredients and second-generation H1 antagonists (cetirizine, loratadine, fexofenadine). Many of our customers begin Soothe+ while still using their antihistamine and taper as the underlying drivers are addressed. We recommend consulting your physician if you are taking prescription medications.
Yes. Standard butterbur extract contains hepatotoxic pyrrolizidine alkaloids, which is why butterbur was restricted in several jurisdictions. Soothe+ uses Ze339, a standardized extract processed via supercritical CO₂ extraction that removes PAs to below detection limits. Every lot is tested and certified PA-free before release.
There are no known contraindications between Soothe+ and standard HRT protocols. DIM affects estrogen metabolite ratios (2:16) but does not affect total estrogen exposure. If you are on prescription HRT, we recommend discussing supplementation with your prescribing physician for completeness.
Soothe+ is not recommended during pregnancy or lactation — DIM and certain phytochemicals have not been adequately studied in these populations. Discontinue at least two weeks prior to elective surgery, as krill oil has mild antithrombotic properties. Consult your physician if you have liver disease, are taking immunomodulatory medications, or have a hormone-sensitive condition.
You've seen the science.
Now see if it works for you.
The 60-day guarantee is structured around the formulation's pharmacodynamic profile — enough time for Layer 3 effects to register. If you're not satisfied, every penny back.
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