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However, definitive confirmation is not possible due to the lack of data
doi:10.5694/mja2.52170 76
But for those with greater needs, including adults over 50, vegans, or people with absorption issues, 500 to 1,000 micrograms is common and well-tolerated. King says its also important to note that third-party tested products (for example, those that are USP, NSF, or ConsumerLab verified) are worth the small potential cost increase because the supplement industry is generally poorly regulated. Finally, I recommend avoiding proprietary blends that dont show exact B12 amounts, products combining B12 with stimulants or energy boosters (which is usually just caffeine driving the energy claim, not the B12), and anything making marketing claims about weight loss or metabolism, says King
Check eligibility at medicare.gov or trumpRx.gov
