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Dietary supplement

High Strength Spirulina 500 mg Ingredients & Drug Interactions

by Simply Supplements

High Strength Spirulina 500 mg label
See full label image
Capsule 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 High Strength Spirulina 500 mg 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

High Strength Spirulina 500 mg is a dietary supplement by Simply Supplements with 1 active ingredient. Its ingredients are commonly taken for general nutrition and energy, antioxidant support, cholesterol and metabolic health.Based on those ingredients, 327 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are organic Spirulina. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against High Strength Spirulina 500 mg by Simply Supplements

Ask about any prescription or over-the-counter medication and we check it for interactions with High Strength Spirulina 500 mg by Simply Supplements — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of High Strength Spirulina 500 mg by Simply Supplements

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: organic spirulina, a type of blue-green algae. The spirulina is housed in an HPMC vegetarian capsule (the capsule material itself is inactive).

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 Blue-green Algae's overall clinical evidence instead.

Moderate

Some clinical evidence supports Blue-green Algae 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: Hypertension — rated "Possibly Effective" (Natural Medicines).

The evidence for spirulina is mixed and depends on what you're taking it for. It's rated possibly effective for high blood pressure.

For acne, hay fever (allergic rhinitis), iron deficiency anemia, and arsenic poisoning, the evidence isn't strong enough to rate — the data we hold shows insufficient reliable evidence for those uses.

The evidence, ingredient by ingredient Blue-green Algae

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.

Spirulina is generally well tolerated when taken by mouth. The most common side effects are mild and digestive: abdominal cramps, bloating, diarrhea, dizziness, fatigue, flatulence, headache, nausea, and vomiting.

Allergic reactions are uncommon but possible — they can range from rashes and itching to severe reactions like anaphylaxis (difficulty breathing, swelling). A small number of people taking spirulina have reported mild gum bleeding or bruising.

One important caution: the quality and purity of spirulina products varies. Some can be contaminated with toxins or heavy metals.

There's limited safety data for spirulina overall, and contamination is a genuine concern — talk with your pharmacist about whether this product is right for you. Pregnancy and lactation safety data is not on file.

Side effects, ingredient by ingredient Blue-green Algae

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 — Blue-green Algae.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs; diabetes medications.
  • For scale: 327 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.

Before you start this spirulina, double-check it with your pharmacist if you take blood thinners or antiplatelet drugs (like warfarin or aspirin), diabetes medications, or immunosuppressants. Spirulina may theoretically affect how these work.

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.

Spirulina may help with high blood pressure, but the evidence for other uses isn't solid yet. If you take blood thinners, diabetes medications, or immunosuppressants, you'll need to check with your pharmacist first — interactions are possible.

Quality and contamination vary between brands, so ask your pharmacist which products are reliable.

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 Feb 24, 2017.

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 High Strength Spirulina 500 mg, straight from the product label.

Brand Simply Supplements
Barcode (UPC) 5060208413960
Net contents 30 Capsule(s)
Market status On market
Date entered into DSLD Feb 24, 2017
DSLD ID 71166
Product type Non-nutrient/non-botanical
Supplement form Capsule
Dietary claims / uses All Other
Intended target group(s) Vegetarian, Adult (18 - 50 Years)
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 High Strength Spirulina 500 mg by Simply Supplements, 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:
1 Capsule(s)
Maximum serving Sizes:
1 Capsule(s)
UPC/BARCODE
5060208413960
IngredientAmount% DV
organic Spirulina500 mg--

Other ingredients: HPMC Vegetarian Capsule

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.
General Statements

100% natural & organic

Product Information Spirulina is a unique type of blue/green algae that grows in fresh water and is a valuable source of chlorophyll, vitamins, minerals and amino acids. Our high strength spirulina 500mg supplement is exclusively available in our EasyGest capsules.

Image is for illustration purposes only.

EasyGest capsules ~ Easy to swallow ~ Easy to absorb ~ Easy to digest ~ No product odour ~ No bad taste

AutoDespatch Save 10% and get free P&P on all repeat orders by having your favourite supplements conveniently scheduled and delivered automatically with our unique AutoDespatch system. Same day despatch We will ensure your order is despatched on the day of receipt (when placed before 12.30pm) and that all orders placed after 12.30pm are despatched on the next working day. All sent 1st class!

PriceMatch guarantee! If you buy from us and then see the same product cheaper elsewhere we will refund the difference plus 10%!

Seals/Symbols

Quality Assured

Suggested/Recommended/Usage/Directions

Suggested Daily Intake Take two to four capsules daily as a food supplement or as directed by a healthcare professional.

Important Information If you are taking any prescription medication, you have a medical condition or you have specific concerns about the suitability of our products, always consult your GP or Pharmacist prior to taking supplements.

Precautions

Do not exceed stated dose.

Keep away from children at all times.

Do not use if seal is broken.

Pregnant or lactating women should consult a doctor before using this product.

Food Supplement: This product should not be used as a substitute for a varied diet.

Storage

Store in a cool dry place.

Formulation

Suitable for vegetarians.

General

S618

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

See for yourself

High Strength Spirulina 500 mg by Simply Supplements label

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

High Strength Spirulina 500 mg 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 High Strength Spirulina 500 mg by Simply Supplements

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Capsule(s) Dosage formCapsule Amounts shown are per serving.

Organic Spirulina

Interacts with
327 drugs
500 mg per serving

Blue-green algae are nutrient-rich aquatic microorganisms (such as spirulina and Klamath Lake algae) taken as a supplement for energy, nutrition, and...

Organic Spirulina monograph & interactions

Other (inactive) ingredients: HPMC Vegetarian Capsule. These complete the product’s ingredient list but are not active constituents.

Interaction report

High Strength Spirulina 500 mg by Simply Supplements Drug Interactions

Want to check YOUR meds against High Strength Spirulina 500 mg?

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
327Drugs
327 Moderate

Ingredients driving the most interactions

organic Spirulina 327

Individual Drug Interactions

The ingredients in High Strength Spirulina 500 mg interact with 327 drugs. Click any drug to see the details.

1 of the 1 ingredient in High Strength Spirulina 500 mg interact with drugs. Each result below shows which ingredient is responsible. organic Spirulina

Each ingredient & the kinds of drugs it affects

For each ingredient in High Strength Spirulina 500 mg 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.

organic Spirulina3 drug types · 327 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, spirulina blue-green algae might increase the risk of bleeding if used with other anticoagulant or antiplatelet drugs. However, this is unlikely.
Spirulina blue-green algae have shown antiplatelet and anticoagulant effects in vitro. However, one preliminary study in 24 patients receiving spirulina blue-green algae 2.3 grams daily for 2 weeks showed no effect on platelet activation or measures of clotting time.

Likelihood Unlikely Evidence D
Antidiabetes Drugs

Theoretically, taking blue-green algae with antidiabetes drugs might increase the risk of hypoglycemia.
Human research shows that spirulina blue-green algae can have hypoglycemic effects in patients with diabetes, at least some of whom were using antidiabetes drugs. However, blue-green algae does not seem to improve glycated hemoglobin (HbA1c) levels in patients with diabetes. A meta-analysis of animal studies also suggests that spirulina blue-green algae have hypoglycemic effects.

Likelihood Possible Evidence B
Immunosuppressants

Theoretically, concurrent use of blue-green algae might interfere with immunosuppressive therapy.
Blue-green algae have been shown to stimulate the immune system.

Likelihood Possible Evidence D
organic Spirulina full monograph & interactions
The maker

Brand information

Manufacturer and brand details for High Strength Spirulina 500 mg, from the product label.

Simply Supplements

See all Simply Supplements products
Name
Simply Supplements
Street Address
PO Box 1330
City
Peterborough
ZipCode
PE2 2PW
Phone Number
0800 988 0292
Pharmacist Counseling Corner

High Strength Spirulina 500 mg by Simply Supplements: Common Questions

Does High Strength Spirulina 500 mg by Simply Supplements interact with any medications?
Yes. Based on its ingredients, High Strength Spirulina 500 mg has a known interaction with 327 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
High Strength Spirulina 500 mg contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism 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.
Can I take this if I'm pregnant or breastfeeding?
We don't have safety data on file for spirulina in pregnancy or breastfeeding. Talk with your doctor or pharmacist about whether it's right for you — this is an individual decision that depends on your health.
What are the most common side effects?
Most people tolerate spirulina well. If side effects do happen, they're usually digestive — bloating, diarrhea, nausea, headache, or fatigue. Allergic reactions are uncommon but can occur, ranging from rashes to severe reactions in rare cases.
Does spirulina actually lower blood pressure?
The evidence suggests it's possibly effective for high blood pressure, so there's reason to think it might help — but the data isn't bulletproof yet. If you're interested, ask your pharmacist whether it's a reasonable addition to your regimen.
What's the contamination risk I keep hearing about?
Spirulina products vary in quality. Some batches have contained toxins or heavy metals. Your pharmacist can point you toward brands with solid quality control, which lowers that risk.
Will this interact with my antidiabetes medication?
Possibly — spirulina can lower blood sugar, and if you're already on diabetes medication, that combination might increase the risk of low blood sugar (hypoglycemia). Check with your pharmacist before starting, especially if your blood sugar is already well controlled.

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

Not sure if High Strength Spirulina 500 mg 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.

High Strength Spirulina 500 mg label
Go deeper

The Full Monographs Behind High Strength Spirulina 500 mg’s Ingredients

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

Herb & supplement monograph

Blue-green Algae

Interacts with 327 drugs

Blue-green algae are nutrient-rich aquatic microorganisms (such as spirulina and Klamath Lake algae) taken as a supplement for energy, nutrition, and general wellness. Evidence for most heal...

Read the full Blue-green Algae monograph →
Sources

Sources & How We Checked

High Strength Spirulina 500 mg'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 22 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.

Blue-green Algae 22 references
  1. Jensen GS, Ginsberg DJ, Huerta P, et al. Consumption of Aphanizomenon flos-aquae has rapid effects on the circulation and function of immune cells in humans. A novel approach to nutritional mobilization of the immune system. JANA 2000;2:50-6.
  2. Iwasa M, Yamamoto M, Tanaka Y, et al. Spirulina-associated hepatotoxicity. Am J Gastroenterol 2002;97:3212-13. PubMed
  3. Hayashi O, Katoh T, Okuwaki Y. Enhancement of antibody production in mice by dietary Spirulina platensis. J Nutr Sci Vitaminol (Tokyo) 1994;40:431-41.. PubMed
  4. Vitale S, Miller NR, Mejico LJ, et al. A randomized, placebo-controlled, crossover clinical trial of super blue-green algae in patients with essential blepharospasm or Meige syndrome. Am J Ophthalmol 2004;138:18-32. PubMed
  5. Mani UV, Desai S, Iyer U. Studies on the long-term effect of spirulina supplementation on serum lipid profile and glycated proteins in NIDDM patients. J Nutraceut 2000;2(3):25-32. DOI
  6. Chiu HF, Yang SP, Kuo YL, et al. Mechanisms involved in the antiplatelet effect of C-phycocyanin. Br J Nutr 2006;95:435-40. PubMed
  7. Hsiao G, Chou PH, Shen MY, et al. C-phycocyanin, a very potent and novel platelet aggregation inhibitor from Spirulina platensis. J Agric Food Chem 2005;53:7734-40.
  8. Katz M, Levine AA, Kol-Degani H, Kav-Venaki L. A compound herbal preparation (CHP) in the treatment of children with ADHD: a randomized controlled trial. J Atten Disord 2010;14:281-91. PubMed
  9. Madhyastha, H. K., Radha, K. S., Sugiki, M., Omura, S., and Maruyama, M. Purification of c-phycocyanin from Spirulina fusiformis and its effect on the induction of urokinase-type plasminogen activator from calf pulmonary endothelial cells. Phytomedicine PubMed
  10. Mazokopakis, E. E., Karefilakis, C. M., Tsartsalis, A. N., Milkas, A. N., and Ganotakis, E. S. Acute rhabdomyolysis caused by Spirulina (Arthrospira platensis). Phytomedicine. 2008;15(6-7):525-527. PubMed
  11. Halidou, Doudou M., Degbey, H., Daouda, H., Leveque, A., Donnen, P., Hennart, P., and Dramaix-Wilmet, M. [The effect of spiruline during nutritional rehabilitation: systematic review]. Rev.Epidemiol.Sante Publique 2008;56(6):425-431.
  12. Konno, T., Umeda, Y., Umeda, M., Kawachi, I., Oyake, M., and Fujita, N. [A case of inflammatory myopathy with widely skin rash following use of supplements containing Spirulina]. Rinsho Shinkeigaku 2011;51(5):330-333. PubMed
  13. Le TM, Knulst AC, Röckmann H. Anaphylaxis to Spirulina confirmed by skin prick test with ingredients of Spirulina tablets. Food Chem Toxicol 2014;74:309-10. PubMed
  14. Rzymski P, Niedzielski P, Kaczmarek N, Jurczak T, Klimaszyk P. The multidisciplinary approach to safety and toxicity assessment of microalgae-based food supplements following clinical cases of poisoning. Harmful Algae 2015;46:34-42. DOI
  15. Petrus M, Culerrier R, Campistron M, et al. First case report of anaphylaxis to spirulin: identification of phycocyanin as responsible allergen. Allergy 2010;65(7):924-5. PubMed
  16. Marles RJ, Barrett ML, Barnes J, et al. United States Pharmacopeia safety evaluation of spirulina. Crit Rev Food Sci Nutr 2011;51(7):593-604. PubMed
  17. Majdoub H, Ben Mansour M, Chaubet F, et al. Anticoagulant activity of a sulfated polysaccharide from the green alga Arthrospira platensis. Biochim Biophys Acta 2009;1790(10):1377-81. PubMed
  18. Cha BG, Kwak HW, Park AR, et al. Structural characteristics and biological performance of silk fibroin nanofiber containing microalgae spirulina extract. Biopolymers 2014;101(4):307-18. PubMed
  19. Jensen GS, Drapeau C, Lenninger M, Benson KF. Clinical safety of a high dose of phycocyanin-enriched aqueous extract from Arthrospira (Spirulina) platensis: results from a randomized, double-Blind, placebo-controlled study with a focus on anticoagulant ac
  20. Hamedifard Z, Milajerdi A, Reiner Z, Taghizadeh M, Kolahdooz F, Asemi Z. The effects of spirulina on glycemic control and serum lipoproteins in patients with metabolic syndrome and related disorders: A systematic review and meta-analysis of randomized con
  21. Moradi S, Zobeiri M, Feizi A, Clark CCT, Entezari MH. The effects of spirulina (Arthrospira platensis) supplementation on anthropometric indices, blood pressure, sleep quality, mental health, fatigue status and quality of life in patients with ulcerative
  22. Ghanbari F, Amerizadeh A, Behshood P, Moradi S, Asgary S. Effect of microalgae arthrospira on biomarkers of glycemic control and glucose metabolism: a systematic Review and meta-analysis. Curr Probl Cardiol 2022;47(10):100942. PubMed

See these in context on the Blue-green Algae 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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