Interactions on record — worth a quick check against your medications. Based on 1 of 2 ingredients. Check your meds →
Dietary supplement

Yaeyama Chlorella Ingredients & Drug Interactions

by Jarrow Formulas

Yaeyama Chlorella label
See full label image
Powder Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Yaeyama Chlorella against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Yaeyama Chlorella is a dietary supplement by Jarrow Formulas with 2 active ingredients. Its ingredients are commonly taken for general nutrition and 'detox' support, immune support, liver and kidney support.Based on those ingredients, 337 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Yaeyama Chlorella. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Yaeyama Chlorella by Jarrow Formulas

Ask about any prescription or over-the-counter medication and we check it for interactions with Yaeyama Chlorella by Jarrow Formulas — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Yaeyama Chlorella by Jarrow Formulas

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: Yaeyama Chlorella, which is a freshwater algae. It's the whole ingredient — there's nothing else added.

Chlorella is sometimes used to support general wellness, though the evidence for specific health claims varies.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed

This product doesn't appear to be marketed for a specific use, so we graded Chlorella's overall clinical evidence instead.

Moderate

Some clinical evidence supports Chlorella for:

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.
  • Since the label doesn't commit to one use, we graded the ingredient's overall clinical evidence instead.
  • On file: Pregnancy-related iron deficiency — rated "Possibly Effective" (Natural Medicines).

The data shows chlorella is possibly effective for pregnancy-related iron deficiency. For other uses listed — brain tumors, fatty liver disease, depression, and fatigue — there isn't enough reliable evidence yet to know whether it works.

If you're considering it for iron support during pregnancy, that's the one area where there's some backing, but talk with your doctor first.

The evidence, ingredient by ingredient Chlorella

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Chlorella is generally well tolerated in the short term, though product quality varies widely from brand to brand. The most common side effects are allergic reactions, stomach cramping, constipation or diarrhea, fatigue, gas, nausea, sun sensitivity, and green-tinted stools — especially in the first two weeks.

A small number of trial participants experienced nausea or diarrhea; in one trial, a few people on chlorella tablets or extract had temporary worsening of constipation or mild diarrhea. Rarely, serious allergic reactions including anaphylaxis have been reported.

The safety data isn't extensive enough; avoid this product unless your doctor approves it.

Side effects, ingredient by ingredient Chlorella

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Chlorella.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs.
  • For scale: 337 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your pharmacist if you take warfarin (Coumadin) or any blood thinners — chlorella can reduce their effect. Also double-check any medications that increase sun sensitivity, like certain antibiotics or anti-inflammatory drugs.

Use the search tool on this page to verify your exact medications.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence behind its ingredients' uses. Moderate medication interactions have been identified, and safety information is well characterized.

If your doctor recommends chlorella for iron support in pregnancy or another specific reason, it's an option worth discussing — but product purity varies, so quality matters. If you take warfarin or any sun-sensitizing medication, check with your pharmacist first.

Start slow and watch for stomach upset or skin reactions in sunlight. Always run it by us before you add it to your routine.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Apr 25, 2019.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Yaeyama Chlorella, straight from the product label.

Brand Jarrow Formulas
Barcode (UPC) 790011170020
Net contents 3.5 Oz(s); 100 Gram(s)
Market status On market
Date entered into DSLD Apr 25, 2019
DSLD ID 201893
Product type Non-nutrient/non-botanical
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Gluten Free, Dairy Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Yaeyama Chlorella by Jarrow Formulas, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
0.5 tsp
Maximum serving Sizes:
0.5 tsp
Servings per container
50
UPC/BARCODE
790011170020
IngredientAmount% DV
Calories10 Calorie(s)--
Protein1 Gram(s)2%
Yaeyama Chlorella2 Gram(s)--

Other ingredients: 100% Yaeyama Chlorella

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Suggested/Recommended/Usage/Directions

Usage: Mix 1/2 teaspoon (2 g) with juice or water or as directed by your qualified healthcare professional.

Precautions

Note: If you have a medical condition, are pregnant, lactating, trying to conceive, under the age of 18, or taking medications, consult your healthcare professional before using this product.

Note: If you have a medical condition, are pregnant, lactating, trying to conceive, under the age of 18, or taking medications, consult your healthcare professional before using this product.

Keep out of the reach of children.

Formula

Yaeyama Chlorella is a single-celled, fresh water algae, grown in the environmentally pristine coral reef region of Japan's Ishigaki Island. Yaeyama Chlorella cell walls are broken by a high-impact, jet-spray drying process. Yaeyama Chlorella provides chlorophyll, RNA, DNA, and proteins, and is a source of naturally occurring vitamins and minerals. Yaeyama Chlorella supports healthy cell function and promotes detoxification, especially heavy metal excretion. "Yaeyama" means richer, more flavorful and more nutritious chlorella! 100% Pure Yaeyama Chlorella

100% Pure Chlorella Provides RNA, DNA and Chlorophyll

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

General Statements

Japan Ishigaki Island

Packaged by weight, not by volume.

FDA Statement of Identity

Dietary Supplement

Seals/Symbols

Vegan V

Formulation

No wheat, gluten, soybeans, dairy, egg, fish/shellfish, or peanuts/tree nuts.

Suitable for Vegetarians/Vegans.

General

01318YCPD PROD # 117002

Brand IP Statement(s)

2018 Jarrow Formulas

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Yaeyama Chlorella by Jarrow Formulas label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Yaeyama Chlorella label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Yaeyama Chlorella by Jarrow Formulas

These are the 2 active ingredients this product is made of. Select any to open its full monograph.

Serving size0.5 tsp Dosage formPowder Servings per container50 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Protein

1 Gram(s) per serving

Yaeyama Chlorella

Interacts with
337 drugs
2 Gram(s) per serving

Chlorella is a nutrient-rich freshwater green algae taken as a supplement for general wellness, immune support, and 'detox.' Some small studies sugges...

Yaeyama Chlorella monograph & interactions

Other (inactive) ingredients: 100% Yaeyama Chlorella. These complete the product’s ingredient list but are not active constituents.

Interaction report

Yaeyama Chlorella by Jarrow Formulas Drug Interactions

Want to check YOUR meds against Yaeyama Chlorella?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
337Drugs
337 Moderate

Ingredients driving the most interactions

Yaeyama Chlorella 337

Individual Drug Interactions

The ingredients in Yaeyama Chlorella interact with 337 drugs. Click any drug to see the details.

1 of the 2 ingredients in Yaeyama Chlorella interact with drugs. Each result below shows which ingredient is responsible. Yaeyama Chlorella

Each ingredient & the kinds of drugs it affects

For each ingredient in Yaeyama Chlorella with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Yaeyama Chlorella2 drug types · 337 drugs

Photosensitizing Drugs

Theoretically, chlorella might have additive effects with photosensitizing drugs.
Chlorella has been reported to cause photosensitization. In five case reports, patients who had ingested chlorella exhibited swelling followed by erythematopurpuric lesions on sun-exposed areas of the body. Theoretically, concomitant use with photosensitizing drugs may exacerbate effects.

Likelihood Possible Evidence D
Warfarin (Coumadin)

Theoretically, chlorella might reduce the clinical effects of warfarin.
Chlorella contains significant amounts of vitamin K. There is at least one case report of warfarin therapy becoming sub-therapeutic after initiation of chlorella supplements.

Likelihood Possible Evidence D
Yaeyama Chlorella full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Yaeyama Chlorella, from the product label.

Jarrow Formulas

See all Jarrow Formulas products
Name
Jarrow Formulas Superior Nutrition and Formulation
Street Address
P.O. Box 35994
City
Los Angeles
State
CA
ZipCode
90035-4317
Web Address
www.Jarrow.com
Pharmacist Counseling Corner

Yaeyama Chlorella by Jarrow Formulas: Common Questions

Does Yaeyama Chlorella by Jarrow Formulas interact with any medications?
Yes. Based on its ingredients, Yaeyama Chlorella has a known interaction with 337 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Yaeyama Chlorella contains 2 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What's the difference between chlorella and spirulina?
The product facts we have don't cover spirulina, so I can't compare them for you. That's a good question for your pharmacist — they can tell you how they differ and which might fit your needs better.
Is chlorella safe if I'm pregnant?
There's not enough safety data on file for us to say yes or no. The data shows it's possibly effective for pregnancy-related iron deficiency, but talk with your doctor before you start — they can weigh what you need against what we know and what we don't.
Can chlorella turn my poop green?
Yes, green-tinted stools are a known side effect. It's harmless, just the chlorella coming through. It should clear up once your body adjusts or you stop taking it.
Will I get stomach issues on this?
Many people don't, but stomach cramps, diarrhea, constipation, gas, and nausea are common — especially in the first two weeks. Start with a small dose and work up slowly. If it doesn't settle down, it might not be right for you.
Can I get a rash from chlorella in the sun?
Yes. Chlorella has been reported to cause sun sensitivity, and there are case reports of people getting swelling and rashes on sun-exposed skin after taking it. If you notice any skin reaction when you're outside, stop and talk to your doctor.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Yaeyama Chlorella is safe with your meds?

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Yaeyama Chlorella label
Go deeper

The Full Monographs Behind Yaeyama Chlorella’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Chlorella

Interacts with 337 drugs

Chlorella is a nutrient-rich freshwater green algae taken as a supplement for general wellness, immune support, and 'detox.' Some small studies suggest possible benefits for cholesterol, blo...

Read the full Chlorella monograph →
Sources

Sources & How We Checked

Yaeyama Chlorella's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 13 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Chlorella 13 references
  1. Peirce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York, NY: William Morrow and Co., 1999.
  2. Ng TP, Tan WC, Lee YK. Occupational asthma in a pharmacist induced by chlorella, a unicellular algae preparation. Resp Med 1994;88:555-7. PubMed
  3. Jitsukawa K, Suizu R, Hidano A. Chlorella photosensitization. New phytophotodermatosis. Int J Dermatol 1984;23:263-8. PubMed
  4. Merchant RE, Carmack CA, Wise CM. Nutritional supplementation with Chlorella pyrenoidosa for patients with fibromyalgia syndrome: a pilot study. Phytother Res 2000;14:167-73.
  5. Merchant RE, Rice CD, Young HF. Dietary Chlorella pyrenoidosa for patients with malignant glioma: effects on immunocompetence, quality of life, and survival. Phytother Res 1990;4:220-31.
  6. Halperin SA, Smith B, Nolan C, et al. Safety and immunoenhancing effect of a Chlorella-derived dietary supplement in healthy adults undergoing influenza vaccination: randomized, double-blind, placebo-controlled trial. CMAJ 2003;169:111-7..
  7. Ohtake, T., Negishi, K., Okamoto, K., Oka, M., Maesato, K., Moriya, H., and Kobayashi, S. Manganese-induced Parkinsonism in a patient undergoing maintenance hemodialysis. Am J Kidney Dis 2005;46(4):749-753. PubMed
  8. Ng, T. P., Tan, W. C., and Lee, Y. K. Occupational asthma in a pharmacist induced by Chlorella, a unicellular algae preparation. Respir.Med. 1994;88(7):555-557. PubMed
  9. Ohkawa, S., Yoneda, Y., Ohsumi, Y., and Tabuchi, M. [Warfarin therapy and chlorella]. Rinsho Shinkeigaku 1995;35(7):806-807.
  10. Azocar J, Diaz A. Efficacy and safety of chlorella supplementation in adults with chronic hepatitis C virus infection. World J Gastroenterol 2013;19(7):1085-90. PubMed
  11. Panahi Y, Badeli R, Karami GR, Badeli Z, Sahebkar A. A randomized controlled trial of 6-week Chlorella vulgaris supplementation in patients with major depressive disorder. Complement Ther Med 2015;23(4):598-602. PubMed
  12. Nakano S, Takekoshi H, Nakano M. Chlorella pyrenoidosa supplementation reduces the risk of anemia, proteinuria and edema in pregnant women. Plant Foods Hum Nutr 2010;65(1):25-30. PubMed
  13. Yavasoglu I, Turgutkaya A, Bolaman Z. Chlorella-induced thrombocytopenia. Sao Paulo Med J 2018;136(6):602-3. PubMed

See these in context on the Chlorella monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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