Iodine
2 brands compared · cheapest first
Life ExtensionBest value
Sea-Iodine (Kelp & Bladderwrack)
1,000 mcg iodine · 60 capsules
$6.00for 60 doses
$0.100per dose
$0.0001 / mcg
Best value by far. From kelp + bladderwrack (food source). 1000mcg is higher than RDA — caution if you have thyroid issues. 150-cap version (B07NC1S4RG, $16.49) similar per-mcg.
Pure Encapsulations
Iodine (Potassium Iodide)
225 mcg iodine · 120 capsules
$20.50for 120 doses
$0.171per dose
$0.000759 / mcg
225mcg matches typical thyroid-support dose. From potassium iodide (cleanest form).
Note
Thorne doesn't carry pure iodine standalone (it's in their Thyrocsin formula). Test thyroid before high-dose iodine — can worsen autoimmune thyroid conditions.