How to use it well.

Daily dose

The dose used in most published human studies is between 1 and 8 grams per day, with 3 grams being a reasonable everyday baseline for general use. Athletic-performance and lipid-lowering studies have used 4–6 grams. Above 10 grams, you’re into experimental territory with diminishing returns and a higher chance of digestive complaint.

A practical starting point: 1 gram for the first week, then increase by 1 gram per week until you reach 3 grams. This avoids the digestive surprise that makes people quit, and lets you notice if anything doesn’t agree with you before you’re committed to a large dose.

When to take it

There is no strong evidence that timing matters. Convention is to take it with a meal, mostly for tolerability — spirulina on an empty stomach gives some people mild nausea. If you take it for athletic performance, a dose 30–60 minutes before exercise is common practice in the studies that report a benefit.

Coffee, vitamin C, and iron absorption.Spirulina’s iron is non-haem, which means coffee and tea (tannins) reduce its absorption while vitamin C improves it. If you’re using spirulina specifically for iron status, take it with citrus fruit and away from your morning coffee.

Powder, tablets, or flakes?

All three are the same dried biomass shaped differently. Choose by use case:

• Tabletsare the easiest if you don’t want to taste it. They’re also slightly more processed (a binder is needed) and slightly more expensive per gram.
• Powder is the cheapest and most flexible. Best for smoothies, salad dressings, energy balls, and pasta dough. The taste is the price you pay.
• Flakes are a halfway form — easier to sprinkle on food than powder, less concentrated than tablets. A small but loyal following uses them on salads and avocado toast. Often slightly more expensive.
• Fresh (paste / wet) spirulina, sold by some home-growers and a few specialist farms, is genuinely a different product — softer flavour, brighter colour, better preserved phycocyanin. It must be refrigerated and used quickly.

How to actually eat it

The two reliable patterns from our community:

1. Hide it. A teaspoon in a banana-and-fruit smoothie, in a chocolate date energy ball, or stirred into pesto disappears almost completely. This is what most long-term users do, even ones who claim they like the taste.
2. Embrace it. Stirred into hummus, miso soup, salad dressings, or fresh pasta dough, it adds a savoury depth that pairs well with citrus, garlic, and olive oil.

Avoid: brewing it in hot water (changes the flavour to something most people dislike), and heating it above 70°C for long periods (degrades phycocyanin and B-vitamins).

What to expect, when

• Days 1–7: a green tongue, slightly green stools (harmless), and possibly mild gas if you start above 1g/day. These all subside.
• Weeks 2–4:people with iron deficiency often report better energy. Most other people notice nothing — that’s expected.
• Months 1–3:if you’re using it for cholesterol, blood pressure, or allergic rhinitis, this is the window where studies start seeing measurable change.

How long to take it

Spirulina is a food. There is no need to cycle it like a pharmaceutical. Many people in our community have taken 1–3g daily for years without issue. If you’re using it for a specific purpose (allergic rhinitis, lipid panel), evaluate whether it’s working at the 12-week mark and decide accordingly.

Next: who should be careful with it, and the few real interactions to be aware of.