Tool
Dosage calculator.
Tell it three things; it suggests a starting daily dose calibrated to the trials we trust. It will not invent numbers your body weight doesn't justify.
Suggested daily dose
0.5 – 2 g/day
General nutritional support
Start at 0.5 g/day for the first week, then increase by ~1 g/week until you reach your range. This avoids the digestive surprise that makes people quit.
Typical daily-use range across community surveys and most non-clinical use.
Daily dose on 0 – 10 g scale
Your dose card · save or share
Right-click the image to save or share — calibrated to your weight, goal, and experience.
What this calculator does
It returns a daily-dose range based on (a) the dose range used in published human trials for your stated goal, (b) a body-weight scaling factor, and (c) whether you’re new to spirulina.
It does not exceed 8 g/dayfor any input — the upper end of the evidence-supported range. Above that you’re into anecdotal territory with diminishing returns.
What it doesn’t do
- It doesn’t account for your medical conditions, medications, or pregnancy. For those, see Should I use spirulina?
- It doesn’t adjust for the quality of your spirulina. A dose of bad spirulina is still a dose of bad spirulina — see quality & purity.
- It doesn’t replace your dietitian or doctor. It’s a starting point.
The dose ranges, in plain language
- 1–2 g/day — general nutritional support; mild iron-status help; allergic rhinitis (per the UC Davis trials).
- 2–4 g/day — established iron deficiency support; modest cholesterol & blood-pressure effects.
- 4–8 g/day — athletic-performance literature; high-end cholesterol-lowering trials.