Well, how much Spirulina are you going to take per dose? If you were planning on something like 50g a day, that would be close to the RDA (which is 18mg) for iron there alone. Most supplements seem to suggest something in the neighborhood of 1-3 grams a day. That would be 0.28-0.84 mg of iron from that supplement, which is much more manageable.
However, if you are concerned about iron, it’s probably best to get an iron panel with ferritin. My guess is that yours would be high (or “high normal”) since you have a history with cancer, and high body iron is associated with that, and likely causal. Getting Ferritin to that near deficiency area (roughly 30-60ng/dl) is helpful at preventing cancer and most other degenerative diseases. Blood donation/phlebotomy remains the most effective and reliable way to lower ferritin.
One thing I learned recently is that, while blood cancers are permanent deferrals for blood donation, most others aren’t. They will defer you during active treatment, and for one year after the end of treatment, but if the cancer is in remission, they might allow you to donate. You can always call the Red Cross or another blood donation center to see if you would be eligible, if that is something you are interested in.
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