Garlic powder mg vs mcg trips up more comparisons than any other label detail. One milligram is 1000 micrograms, so 10 mg of powder and 10,000 mcg are the same quantity of the same material. Same scoop, same fill weight, two different spellings. Nothing was reformulated between the two bottles, and the price difference on the shelf has nothing to do with the unit either one uses.
The arithmetic, once
Milligram to microgram is a three decimal shift. Move the digits three places to the right and you're done. That's the whole operation. A label reading 250 mg becomes 250,000 mcg, and a label reading 250,000 mcg becomes 250 mg. Anyone who has done this once can do it from memory in the aisle.
Worked example with shelf values. Bulb powder listed at 500 mg per capsule equals 500,000 mcg per capsule. A softgel labeled 1,000 mcg of garlic oil is roughly 1 mg of oil, and about 0.5 mg once you account for the common 50 percent oil concentration. Put those two products in the same browser tab and the smaller printed number belongs to the larger product. That reversal is the entire trap, and it catches people who trust the font size.
Where the garlic unit stops being the whole story
Once both products sit in the same unit, the next figure you need is the standardization line. A 500 mg bulb powder capsule with a 1.3 percent allicin yield carries about 6.5 mg of allicin per capsule. A 500 mg capsule with a 0.4 percent yield carries 2 mg. Identical front labels, triple the active fraction, and the powder weight tells you none of it.
That's why 1000 mg of powder and 1000 mg of allicin yield almost never describe the same product. The first is mass. The second is a measured fraction of that mass. Comparing across the two lines, which happens constantly on review sites and listing pages, produces numbers that mean nothing next to each other.
IU adds one more layer. Older products still print international units, a measure of biological activity rather than weight, and IU has no fixed milligram equivalent for garlic because the conversion depends on what the activity assay was measuring. If a label uses IU, convert it to a weight figure only if the manufacturer gives you the factor. Otherwise treat that number as unusable for a direct comparison and compare the standardized fraction on the other bottle instead. A 90 count bottle at $8.99 works out to 10 cents per capsule, but only if the serving is one. Check whether the panel says two, because a two capsule serving doubles it to 20 cents and the bundle math changes with it.
What to compare, in order
Put both products into the same unit, then compare the standardized active per serving, then look at the serving count, and only after that look at price. Garlic is one of the few categories where the cheap bottle and the expensive bottle can hold the same material at the same strength. The gap is usually the standardization line, or the serving count, or both at once.
A limit. Standardized allicin figures depend on an assay method that varies between labs, so a 1.3 percent on one panel is not perfectly comparable to a 1.3 percent on another from a different supplier. Treat the numbers as a rough ranking rather than a precise score, and buy a small bottle first. Sample the powder on food you already cook before committing to a 240 count bundle, since the yield lines shift between lots and the first bottle is the cheapest way to find out how the material behaves in your kitchen.
Frequently asked questions
What is the difference between mg and mcg?Show answerHide answer
A microgram is a thousandth of a milligram, so the number looks much larger.
Why do some labels use IU?Show answerHide answer
Older units like IU describe biological activity rather than weight.
How do I compare across units?Show answerHide answer
Convert to the same unit first, then compare per serving.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
