Best supplement forms.
Forms guides ·20 guides ·Reviewed May 2026
Glycinate or citrate? Ubiquinol or ubiquinone? D3 or D2? These guides compare the real forms of each supplement by absorption, cost, and best use, and link to the full evidence profile for each.
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Every forms guide.
One honest comparison per supplement, with a typical-dose table and a best-for-most pick.
8 forms · best: Glycinate / BisglycinateBest form of magnesium7 forms · best: Ferrous BisglycinateBest form of iron7 forms · best: PicolinateBest form of zinc3 forms · best: Vitamin K2 MK-7Best form of vitamin k3 forms · best: Vitamin D3 (Cholecalciferol)Best form of vitamin d4 forms · best: MethylcobalaminBest form of vitamin b123 forms · best: Methylfolate (5-MTHF)Best form of folate2 forms · best: UbiquinolBest form of coq105 forms · best: Phytosome (Meriva-style)Best form of curcumin5 forms · best: Triglyceride (TG)Best form of fish oil4 forms · best: Ascorbic AcidBest form of vitamin c4 forms · best: Calcium CitrateBest form of calcium3 forms · best: KSM-66Best form of ashwagandha4 forms · best: Creatine MonohydrateBest form of creatine4 forms · best: d-Alpha TocopherolBest form of vitamin e4 forms · best: L-SelenomethionineBest form of selenium3 forms · best: Berberine HClBest form of berberine4 forms · best: Quercetin PhytosomeBest form of quercetin3 forms · best: Trans-ResveratrolBest form of resveratrol2 forms · best: Standard NACBest form of nac