Vitamins

A registered dietitian compares b12 methylcobalamin bioavailability against cyano, adeno, and hydroxocobalamin, with the right form for your goal.

A registered dietitian on the calcium D3 K2 trio: how D3 helps you absorb calcium and where the K2 bone and artery evidence actually stands.

Liposomal vitamin C bioavailability vs standard ascorbic acid, Ester-C, and whole-food forms compared. When the SVCT saturation ceiling actually matters.

K2 MK7 bioavailability vs MK-4: half-life math, RCT evidence, MenaQ7 cost-per-active mcg, and the warfarin warning every reader needs.

A dietitian on vitamin C for skin: once you’re not deficient, swallowing more does little. A topical L-ascorbic-acid serum is what actually reaches your skin.

A registered dietitian weighs the evidence on vitamin C bioflavonoids absorption. One small study says yes, the rest say negligible. Here’s what to buy.

A registered dietitian compares Ester-C vs ascorbic acid vs buffered vitamin C on absorption, GI tolerance, and cost. See which form is worth paying for.

A registered dietitian’s vitamin C guide: the real RDA, where food beats pills, which forms are worth paying for, and the dose where more stops helping.

A complete vitamin K2 guide: MK-4 vs MK-7, food sources, dosing, the warfarin warning, testing, and what the bone and cardiovascular trials show.

Vitamin D bioavailability compared: D2 vs D3, oil softgel vs tablet vs spray, K2 pairing, and the food-fat rule that decides actual 25(OH)D response.