Questions About Taking A Supplement Containing Irish Moss With Birth Control

In our latest question and answer, our pharmacist discusses the safety of combining an Irish sea moss supplement with birth control.

3 min read Updated Jun 2026 Read by 3,318 people
Questions About Taking A Supplement Containing Irish Moss With Birth Control
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Tia asked

I have a supplement pill that contains Irish Moss, Burdock root, and Bladderwrack. I take a birth control pill daily, and I want to be sure that there are no interactions between these two. Thank you.

Apr 04, 2023
The quick answer
  • The ingredients in your supplement (Irish sea moss, bladderwrack, and burdock root) are not known to interact with birth control pills or affect how they work. Excessive iodine from Irish sea moss and bladderwrack could theoretically affect thyroid hormones and menstrual cycles, but taking recommended doses is unlikely to cause problems. It's always best to let your doctor know about any new supplements you're taking along with your birth control.
A quick summary of Dr. Brian Staiger, PharmD's full answer below, condensed by AI from that answer only (not from any outside source). The pharmacist's answer is the source of record.
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Answer

Thanks for reaching out! I'm more than happy to answer this for you.

So, your supplement contains two different types of seaweed (i.e., algae) and a plant:

The first two, Irish sea moss and bladderwrack, are typically used in dietary supplements as a source of iodine and other phytonutrients. Many of these phytonutrients are purported to have anti-inflammatory, antioxidant, and immune-boosting effects.

Burdock root supplements are purported to have a variety of health benefits, including supporting liver function, promoting healthy skin, improving digestion, and supporting healthy blood sugar levels.

Studies show that burdock contains a large number of different constituents (e.g., arctigenin, arctiin, beta-eudesmol, caffeic acid, chlorogenic acid, diarctigenin, inulin, lappaol, tannin, trachelogenin, and sitosterol-beta-D-glucopyranoside), all of which are purported to play a part in its medicinal effects.

Are Irish Seamoss, BladderWrack & Burdock Safe With Oral Contraceptives (i.e., Birth Control)?

There certainly are natural supplements and herbals that are reported to have potential interactions with birth control pills (e.g., Guggul, etc...), so it is always important to check with your doctor or pharmacist before taking anything new.

The good news here is that none of the ingredients in your supplement (Irish sea moss, Bladderwrack, Burdock root) are known to interact with birth control pills or otherwise have any effect on sex hormones.

I do believe it is important to note that excessive iodine consumption (remember that Irish sea moss and Bladderwrack are high in iodine) could theoretically alter thyroid hormone concentrations, which could, in theory, cause changes to a woman's menstrual cycle.

However, it would be very unlikely that taking recommended doses of a supplement containing iodine would cause problems, but this is nevertheless important to be aware of.

What Do They Interact With?

Irish sea moss and bladderwrack have few reported interactions.

Mainly, they could potentially interact with any drug that is affected by increased exposure to iodine, since both of those are iodine rich. An example that comes to mind is thyroid hormone drugs (e.g., levothyroxine).

Bladderwrack does have quite a number of interactions listed (you can see these by going to our individual herbal interaction page for bladderwrack, which is hyperlinked above), but most are considered minor and relatively insignificant.

Burdock, similarly, has very few potential interactions, and they are mainly with blood-thinning drugs due to some studies showing it can have blood-thinning effects.

Overall though, as mentioned, none of the herbal ingredients in your supplement are known to affect birth control pills in any way.

Final Words

I hope you found this helpful!

Before ending here, I always like to point out that when it comes to interactions with natural products, it can often be difficult to definitively know their safety when combined with certain drugs simply based on the lack of published data.

Nevertheless, there is nothing to suggest an interaction in your case.

As always, be sure to let your doctor know about everything you are taking prior to making any changes to your medication regimen.

References & sources
  1. An Overview to the Health Benefits of Seaweeds Consumption — PubMed
  2. Comparison of Nutritional and Nutraceutical Properties of Burdock Roots Cultivated in Fengxian and Peixian of China — PubMed
Glossary — Terms in This Answer
Phytonutrients
Natural compounds found in plants that may provide health benefits beyond basic nutrition.
Anti-inflammatory
Able to reduce swelling, redness, and irritation in the body.
Antioxidant
A substance that helps protect cells from damage caused by harmful molecules called free radicals.
Constituents
The individual chemical components that make up a substance or plant.
Iodine
A mineral that the body needs to produce thyroid hormones and maintain proper thyroid function.
Thyroid hormone
Chemicals produced by the thyroid gland that control metabolism and energy levels in the body.
Levothyroxine
A synthetic thyroid hormone medication used to treat an underactive thyroid gland.
Blood-thinning
Having the ability to reduce blood clotting and make blood flow more easily through the body.
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Dr. Brian Staiger, PharmD
About the pharmacist

Dr. Brian Staiger, PharmD

Clinical Pharmacy

Doctor of Pharmacy, board certified clinical pharmacist (BCPS), American Herbalist Guild, Medication Therapy Management certified

Brian Staiger, PharmD, BCPS, is a licensed pharmacist with more than 13 years of experience across retail pharmacy, clinical pharmacy, medication safety, pharmacy program development, and healthcare administration. He is the founder of HelloPharmacist.com, where he helps patients...

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