What do they mean by "free" and "patented?" It seems contradictory.
What do they mean by “free” and “patented?” It seems contradictory.
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Free means it’s available for use, as opposed to “bound.” Examples would be, free-radicals, free-electrons, free-thyroid hormone, etc.
You could swallow a ball-bearing, but your body wouldn’t get iron from it, because the iron isn’t “free.”