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Two questions, two answers. Which form of a compound to buy — citrate or glycinate, folic acid or methylfolate. And whether two different compounds can share the same window, or need hours between them.

16 combinations

16 families

64 form comparisons

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Two forms of one compound give you a «which to choose» breakdown. Two different compounds give you a compatibility score and a timing plan. Taking more than two? Check the whole stack at once →

Can you take them together?

The combinations people ask about most — scored from documented records

16 pairs

Zinc Picolinate + Copper Bisglycinate Zinc competes with copper for absorption Needs attention 10 Iron Bisglycinate + Calcium Inhibits iron absorption Needs attention 40 Zinc Picolinate + Magnesium Glycinate Very high zinc doses may compete with magnesium Needs attention 58 Calcium + Magnesium Glycinate High calcium can interfere with magnesium absorption Needs attention 64 Vitamin D3 + Vitamin K2 (MK-7) High doses may interfere with K2 function Needs attention 66 Iron Bisglycinate + Magnesium Glycinate No documented interaction No known interaction 70 Calcium + Vitamin D3 Reduces vitamin D conversion efficiency Needs attention 72 Magnesium Glycinate + Melatonin Enhanced relaxation and sleep quality Works better together 78 Magnesium Glycinate + Potassium Citrate Enhanced kidney stone prevention and mineral balance Works better together 78 Collagen Peptides + Vitamin C (Ascorbic Acid) Essential for collagen synthesis and cross-linking Works better together 82 Fish Oil (EPA/DHA) + Vitamin D3 Protects fish oil from oxidation Works better together 90 Iron Bisglycinate + Vitamin D3 Dramatically enhances iron absorption Works better together 94 Zinc Picolinate + Vitamin C (Ascorbic Acid) Both work together for immune function and vision Works better together 94 Vitamin D3 + Magnesium Glycinate Essential cofactor for vitamin D activation Works better together 99 Iron Bisglycinate + Vitamin C (Ascorbic Acid) Dramatically enhances iron absorption Works better together 99 Vitamin B12 (Cyanocobalamin) + Vitamin B9 (Folic Acid) Both involved in homocysteine metabolism Works better together 99

Which form should you buy?

Same compound, different carrier — absorption and cost differ several times over

16 families

Best form of Magnesium

Magnesium Glycinate vs Magnesium Oxide 90% · 4% Magnesium Citrate vs Magnesium Oxide 35% · 4% Magnesium Malate vs Magnesium Oxide 40% · 4% Magnesium Chloride vs Magnesium Oxide 50% · 4% Magnesium Oxide vs Magnesium L-Threonate 4% · 95% Magnesium Citrate vs Magnesium Glycinate 35% · 90% Magnesium Glycinate vs Magnesium Malate 90% · 40% Magnesium Chloride vs Magnesium Glycinate 50% · 90% Magnesium Glycinate vs Magnesium L-Threonate 90% · 95% Magnesium Citrate vs Magnesium Malate 35% · 40% Magnesium Chloride vs Magnesium Citrate 50% · 35% Magnesium Citrate vs Magnesium L-Threonate 35% · 95% Magnesium Chloride vs Magnesium Malate 50% · 40% Magnesium Malate vs Magnesium L-Threonate 40% · 95% Magnesium Chloride vs Magnesium L-Threonate 50% · 95%

Best form of Collagen

Bovine Collagen vs Marine Collagen 90% · 95% Bovine Collagen vs Collagen Peptides 90% · 85% Bovine Collagen vs Undenatured Collagen Type II 90% · 95% Bovine Collagen vs Plant Collagen 90% · 70% Collagen Peptides vs Marine Collagen 85% · 95% Marine Collagen vs Undenatured Collagen Type II 95% · 95% Marine Collagen vs Plant Collagen 95% · 70% Collagen Peptides vs Undenatured Collagen Type II 85% · 95% Collagen Peptides vs Plant Collagen 85% · 70% Plant Collagen vs Undenatured Collagen Type II 70% · 95%

Best form of Zinc

Zinc Citrate vs Zinc Gluconate 70% · 60% Zinc Gluconate vs Zinc Picolinate 60% · 95% Zinc Bisglycinate vs Zinc Gluconate 85% · 60% Zinc Carnosine vs Zinc Gluconate 85% · 60% Zinc Citrate vs Zinc Picolinate 70% · 95% Zinc Bisglycinate vs Zinc Citrate 85% · 70% Zinc Carnosine vs Zinc Citrate 85% · 70% Zinc Bisglycinate vs Zinc Picolinate 85% · 95% Zinc Carnosine vs Zinc Picolinate 85% · 95% Zinc Bisglycinate vs Zinc Carnosine 85% · 85%

Best form of Calcium

Calcium vs Calcium Carbonate 30% · 25% Calcium Carbonate vs Calcium Citrate 25% · 45% Calcium Carbonate vs Calcium Hydroxyapatite 25% · 40% Calcium vs Calcium Citrate 30% · 45% Calcium vs Calcium Hydroxyapatite 30% · 40% Calcium Citrate vs Calcium Hydroxyapatite 45% · 40%

Best form of Iron

Iron Fumarate vs Iron Sulfate 25% · 20% Iron Bisglycinate vs Iron Sulfate 90% · 20% Heme Iron vs Iron Sulfate 85% · 20% Iron Bisglycinate vs Iron Fumarate 90% · 25% Heme Iron vs Iron Fumarate 85% · 25% Heme Iron vs Iron Bisglycinate 85% · 90%

Best form of Vitamin B12

Vitamin B12 (Cyanocobalamin) vs Vitamin B12 (Methylcobalamin) 70% · 85% Vitamin B12 (Hydroxocobalamin) vs Vitamin B12 (Methylcobalamin) 75% · 85% Vitamin B12 (Adenosylcobalamin) vs Vitamin B12 (Methylcobalamin) 80% · 85% Vitamin B12 (Cyanocobalamin) vs Vitamin B12 (Hydroxocobalamin) 70% · 75% Vitamin B12 (Adenosylcobalamin) vs Vitamin B12 (Cyanocobalamin) 80% · 70% Vitamin B12 (Adenosylcobalamin) vs Vitamin B12 (Hydroxocobalamin) 80% · 75%

Best form of Vitamin C

Vitamin C (Ascorbic Acid) vs Vitamin C (Sodium Ascorbate) 80% · 85% Vitamin C (Ascorbic Acid) vs Vitamin C (Liposomal) 80% · 95% Vitamin C (Liposomal) vs Vitamin C (Sodium Ascorbate) 95% · 85%

Best form of Folate

Vitamin B9 (Folic Acid) vs Folate (5-MTHF) 85% · 95% Vitamin B9 (Folinic Acid) vs Folate (5-MTHF) 98% · 95% Vitamin B9 (Folic Acid) vs Vitamin B9 (Folinic Acid) 85% · 98%

Best form of Creatine

Creatine HCL vs Creatine Monohydrate 98% · 95%

Best form of Vitamin D

Vitamin D2 (Ergocalciferol) vs Vitamin D3 60% · 85%

Best form of Protein

Casein Protein vs Whey Protein 85% · 95%

Best form of Omega

Fish Oil (EPA/DHA) vs Krill Oil 85% · 95%

Best form of Curcumin

Curcumin vs Turmeric 3% · 3%

Best form of Vitamin K

Best form of Selenium

Best form of Vitamin E