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More than 160 dietary supplements have received the USP Verified Mark, including multivitamins, single vitamins such as B, C, and D, minerals including iron and magnesium, and other supplements such as probiotics, botanicals and melatonin

Modern lifestyle factors such as poor dietary habits, psychological stress, polypharmacy, and exposure to environmental toxins frequently disrupt microbial balance and lead to dysbiosis, a state increasingly linked to numerous systemic conditions, including endocrine disorders (Ma et al., 2022
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doi: 10.1210/mend-3-1-68 61 CyriacJHaleemRCaiXWangZ

They may be able to suggest useful info to pass to GP
Legumes: Kidney beans, green peas, chickpeas and lentils