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Spirulina

Supplement algae energyimmune
Aka: Arthrospira platensis, blue-green algae
Brands seen in Singapore: California Gold Nutrition, NOW Foods, Nutrex Hawaii, Swanson Vitamins, Micro Ingredients
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Trial data covers weight, bmi and crp — not energy
When to take
Daily
Studied for
Pooled trials ran 6–12 weeks beside exercise
Pros & cons
Pros
  • 17 pooled RCTS: −1.07 kg body weight, −0.84% body fat
  • 7 pooled trials: crp fell 0.55 mg/l versus control
  • Changes were larger when exercise was added too
Cons
  • The crp trials were few and very inconsistent (i²=87%)
  • Supplement-only arms moved less and less consistently
  • 86.7% of shop-bought samples mis-declared content
Sources
  1. Effects of spirulina supplementation on body composition in adults: a GRADE-assessed and dose-response meta-analysis of RCTs (Lak et al., Nutr Metab 2025; 17 RCTs) · read 2026-08-27
    what it says
    “The pooled analysis of 17 RCTs indicated that Spirulina supplementation significantly reduced body weight (BW) (WMD: -1.07 kg; p = 0.004), body mass index (BMI) (WMD: -0.40; p = 0.025), body fat percentage (BFP) (WMD: -0.84%; p = 0.002)”
  2. Effects of Spirulina Supplementation on C-Reactive Protein (CRP): A Systematic Review and Dose-Response Meta-Analysis (Shahraki Jazinaki et al., Food Sci Nutr 2025; 7 trials, n=283) · read 2026-08-27
    what it says
    “Spirulina supplementation significantly reduced serum CRP levels compared to the control group (WMD: -0.55 mg/L; 95% CI: -0.90 to -0.21; p = 0.002). However, heterogeneity among the studies was high (I 2 = 86.7%”
  3. Combined Role of Spirulina and Exercise-Based Interventions in Individuals with Overweight and Obesity: A Systematic Review and Meta-Analysis (Yasul et al., J Clin Med 2026; 10 studies) · read 2026-08-27
    what it says
    “randomized controlled trials (RCTs) evaluating spirulina (1-6 g/day) combined with structured exercise … Effect estimates were generally larger in combined exercise-spirulina subgroups … whereas supplementation-only comparisons demonstrated smaller and less consistent changes.”
  4. Nutritional Quality and Safety of the Spirulina Dietary Supplements Sold on the Slovenian Market (Masten Rutar et al., Foods 2022) · read 2026-08-27
    what it says
    “a high proportion (86.7%) of inappropriate declarations regarding the elemental content was observed. Overall, the study conclusions underline the need for a stricter control system for Spirulina-based supplements.”
  5. HSA — Guidelines on Prohibited and Restricted Ingredients in Health Supplements and Traditional Medicines, GL-CHPB-1-012 Rev 001 (Oct 2025), Annex A/B — searched, no row for this ingredient · read 2026-08-27
    what it says
    “The objective of this guideline is to highlight the substances of concern when used in HS and TM and is not meant to be an exhaustive list.”
  6. iHerb Singapore — Spirulina category (default order, 1 - 48 of 62 results) · read 2026-08-27
    what it says
    “California Gold Nutrition, Organic Spirulina, 60 Tablets (500 mg per Tablet) … NOW Foods, Certified Organic Spirulina, 500 mg … Nutrex Hawaii, Pure Hawaiian Spirulina®, 500 mg … Swanson Vitamins, Spirulina, 500 mg … Micro Ingredients, Organic Spirulina Chlorella”
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Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.