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The amount of vitamins that become available in your body depends on the source and the capacity of the intrinsic factor central to their absorption

Development & validation of LC-MS/MS assay for 5-amino-1-methyl quinolinium in rat plasma: Application to pharmacokinetic and oral bioavailability studies

Sources Body weight and composition in users of levonorgestrel-releasing intrauterine system, Contraception [accessed 17 July 2025] Depo-medroxyprogesterone acetate, weight gain and amenorrhea among obese women adolescent and adult women, The European Journal of Contraception & Reproductive Health Care [accessed 17 July 2025] Effect of birth control pills and patches on weight, Cochrane [accessed 17 July 2025] Effect of the ethinylestradiol/norelgestromin contraceptive patch on body composition

It demands the same level of focus and sterile discipline as any other part of your experiment