supplementation
6 interactions related to supplementation
oral contraceptives + vitamin b6
Combined (estrogen-containing) oral contraceptives modestly lower the active form of vitamin B6, pyridoxal 5'-phosphate, by speeding up tryptophan metabolism. Long-term pill users tend to show lower B6 status markers than non-users. This is a depletion of a status marker rather than a clinical safety problem, and it does not affect how well the pill works.
methylprednisolone + vitamin d
Methylprednisolone (a glucocorticoid) speeds the breakdown of vitamin D and weakens vitamin D-driven intestinal calcium absorption. Over continued therapy this lowers vitamin D status and contributes to glucocorticoid-induced bone loss.
smoking + vitamin c
Smoking increases oxidative stress and accelerates the body's turnover of vitamin C, leaving smokers with consistently lower blood and tissue levels of ascorbic acid than non-smokers eating the same diet. Because of this, expert nutrition bodies recommend that people who smoke aim for a higher daily vitamin C intake than non-smokers.
prednisone + calcium
Glucocorticoids like prednisone impair intestinal calcium absorption and increase urinary calcium loss, contributing to a negative calcium balance and accelerated bone loss. This is a depletion-and-displacement effect, not a chemical interaction in the gut, and it is why calcium and vitamin D are treated as the foundation of bone protection during long-term steroid therapy.
methotrexate + folate
Methotrexate works by blocking the enzyme that recycles folate into its active form, which depletes folate in normal tissues and drives common side effects such as nausea, mouth sores, and elevated liver enzymes. Folic acid supplementation reduces these side effects without compromising efficacy at the doses used for autoimmune disease, but it should not be taken on the same day as methotrexate, and it should never be added on your own when methotrexate is used for cancer.
oral contraceptives + magnesium
Observational studies dating back to the 1970s have found that women taking combined oral contraceptives tend to have somewhat lower serum magnesium levels than non-users, likely through estrogen-related shifts in how the body distributes and excretes magnesium. This is a nutritional observation, not a contraceptive-failure risk. Magnesium does not reduce the pill's effectiveness, and links between low magnesium and pill side effects or clotting risk remain theoretical rather than proven.