[Rockingham]

Quite true. Some poor quality multivitamins include artificial vitamins that are in forms or contain compounds that have anti-vitamin effects, while minerals may be in forms that are poorly absorbed.

My benchmark test is to check the label to see if the Vitamin E is solely in natural form with mixed tocotrienols and tocopherols, and with the magnesium being amino acid chelated (magnesium taurate, glycinate, or L-threonate). As a practical matter, look to buy the most expensive brands, not the cheapest.

[Secret Agent Man]

Yep. And many of the better ones are independently tested by 3rd party places to verify they contain what they say on their labels.

[miniTAX]

“My benchmark test is to check the label to see if the Vitamin E is solely in natural form with mixed tocotrienols and tocopherols, and with the magnesium being amino acid chelated (magnesium taurate, glycinate, or L-threonate). As a practical matter, look to buy the most expensive brands, not the cheapest”

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The first sentence seems science based and is probably credible even if nutritional science is atrociously bad (I say it despite taking bisglycinate magnesium). The second sentence is pulled out of your hat, typical of bait and switch manipulative tactics.

[Cold Heart]

...look to buy the most expensive brands

I would change that to more expensive. Some high end brand names have turned out to be not worth it. Boars Head meats just came to mind.