Supplements and Combined ethinylestradiol 30mcg.
Combined ethinylestradiol 30mcg is hormone replacement therapy (oestrogen component) for menopausal symptoms.
Combined ethinylestradiol 30mcg is hormone replacement therapy (the oestrogen component). UK prescribing has shifted substantially since the early 2000s WHI trial retreat. Transdermal oestradiol is now the preferred delivery route over oral conjugated equine oestrogens, because the VTE and stroke risk signals were largely associated with the oral route. The supplement surface for the transdermal route is small, because the gut wall and first-pass liver metabolism are bypassed. Oral oestrogen formulations remain in CYP3A4 territory. St John's Wort is flagged by the BNF for potentially reduced efficacy. Symptom relief supplements often co-used during HRT (black cohosh, soya isoflavones, red clover, evening primrose oil) sit on top of HRT without strong interaction signals. The evidence base for any of them as additive benefit is modest. Vitamin D and calcium status matter for the bone density conversation.
We have not yet completed an explicit assessment of supplement interactions with Combined ethinylestradiol 30mcg in the Distil database. That is different from saying nothing exists. We surface this distinction deliberately: the Distil checker tells you when we have explicitly assessed a pair and when we have not, because both are useful information. If you take Combined ethinylestradiol 30mcg alongside a supplement, the checker below will surface anything already in our database, and the missing-item form at the bottom of the page routes uncatalogued pairs into our next curation pass.
What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope (food-supplement interactions only; for drug-drug interactions, the BNF is authoritative). Use the checker below to surface any supplement, and submit a missing item if you take something we have not catalogued.
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How we grade severity, choose what's in scope, and what we exclude.
Every call on this page is reasoned. We publish the full rubric for severity tiers, the medication inclusion logic, the evidence grades we accept, and what we deliberately leave out. About three thousand words. Worth reading once if you use this tool more than occasionally.
Read the full methodologyA full supplement review, built around you, not a generic stack.
The free checker answers one interaction question at a time. A Distil report reviews the bigger picture: your goals, diet, medications, current supplements and any blood results you provide, then shows what appears worth keeping, changing, adding or leaving out.
- what your diet already covers, so you are not adding a capsule for something food is already handling
- which evidence-graded compounds are worth considering for your goals, and which were considered but left out
- what to keep, change or stop from what you already take, plus the order to introduce anything new
- how your medications and complete supplement stack fit together, with daily timing and a clear point for reassessment
The interaction check is one section of the full report. You also get the reasoning behind each recommendation and the evidence references used.
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If a supplement or medication you take isn't in our autocomplete, tell us. We go through what people flag every week and add what's missing.