It’s just thorough mixing and the law of averages. But the law of averages becomes increasingly accurate as sample size gets bigger, and the supplements are ground into such a fine powder that there are a huge number of particles in each capsule.
In true eli5 terms: each ingredient is powdered and mixed thoroughly together, meaning there are a huge number of particles of each in each capsule. It would be extremely statistically unlikely for that number of particles to vary substantially from the average of the whole mixture
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