Ingredient intelligence
Know your ingredients.
Objective guides to ingredient identity, core function, human evidence, safety context, and the related forms worth comparing.
559 of 559 ingredient guides
A–Z catalog · 48 per page
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Research topics explain why an ingredient is studied; they are not treatment claims or outcome guarantees.
241
Huperzine A
Huperzine A is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 242Hyaluronic Acid
Studies of Hyaluronic Acid examine skin hydration and joint-comfort measures, but results and practical relevance vary by form, population, and outcome. 243Hyaluronic Acid Msm
Hyaluronic Acid Msm combines multiple active materials; evidence on individual components cannot establish the effect of the finished formula. 244Hydrangea Root
Hydrangea Root is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 245Immunoglobulin G
Immunoglobulin G is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 246Indole-3-Carbinol
Indole-3-Carbinol is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 247Inositol
Studies of Inositol examine insulin signaling and reproductive-metabolic measures, but results and practical relevance vary by form, population, and outcome. 248Inositol Hexanicotinate
Inositol Hexanicotinate is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 249Inulin
Inulin is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 250Inulin Fos
Research on Inulin Fos is strongest for specific measured outcomes related to bowel regularity, microbiome composition, and digestive tolerance; form, amount, and study context still matter. 251Iodine
Iodine is studied for iodine adequacy and normal thyroid-hormone synthesis; evidence and product identity depend on the exact form, preparation, and measured outcome. 252IP-6
IP-6 is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 253Ipriflavone
Ipriflavone is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 254Irish Sea Moss
Irish Sea Moss is marketed for fiber, mineral, and thyroid-related nutrient exposure, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 255Iron
Iron is best understood by separating its established physiological role from claims about benefits of additional supplementation. 256Isatis Root
Isatis Root is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 257Jerusalem Artichoke
Jerusalem Artichoke is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 258Juniper Berry
Juniper Berry is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 259Kanna Extract
Kanna Extract is studied for stress, mood, and cognitive measures, although direct human evidence remains limited and product forms are not interchangeable. 260Kava
Kava is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 261Kelp
Kelp is studied for iodine exposure and thyroid-related nutrient adequacy, although direct human evidence remains limited and product forms are not interchangeable. 262Keratin
Keratin is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 263Kola Nut
Kola Nut is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 264Korean Ginseng
Studies of Korean Ginseng examine fatigue, cognition, glucose, and immune measures, but results and practical relevance vary by form, population, and outcome. 265Krill Oil
Studies of Krill Oil examine omega-3 status, lipid, and joint-comfort measures, but results and practical relevance vary by form, population, and outcome. 266Kudzu Root
Kudzu Root is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 267L-Alanine
L-Alanine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 268L-Arginine
L-Arginine is studied for blood-flow, blood-pressure, and exercise-related measures; evidence and product identity depend on the exact form, preparation, and measured outcome. 269L-Arginine + L-Citrulline
L-Arginine + L-Citrulline combines multiple active materials; evidence on individual components cannot establish the effect of the finished formula. 270L-Aspartic Acid
L-Aspartic Acid is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 271L-Carnitine
L-Carnitine is studied for carnitine adequacy, exercise, and selected metabolic measures; evidence and product identity depend on the exact form, preparation, and measured outcome. 272L-Carnosine
L-Carnosine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 273L-Citrulline
Studies of L-Citrulline examine blood-flow, exercise performance, and muscle-soreness measures, but results and practical relevance vary by form, population, and outcome. 274L-Cysteine
L-Cysteine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 275L-Glutamine
Studies of L-Glutamine examine gut-barrier, recovery, and immune measures under physiological stress, but results and practical relevance vary by form, population, and outcome. 276L-Histidine
L-Histidine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 277L-Isoleucine
L-Isoleucine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 278L-Leucine
L-Leucine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 279L-Lysine
L-Lysine is studied for amino-acid adequacy and selected stress or recurrence-related measures; evidence and product identity depend on the exact form, preparation, and measured outcome. 280L-Methionine
L-Methionine is best understood by separating its established physiological role from claims about benefits of additional supplementation. 281L-Norvaline
L-Norvaline is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 282L-Ornithine
L-Ornithine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 283L-Phenylalanine
L-Phenylalanine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 284L-Proline
L-Proline is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 285L-Selenomethionine
L-Selenomethionine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 286L-Serine
L-Serine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 287L-Theanine
Studies of L-Theanine examine stress response, attention, and sleep quality, but results and practical relevance vary by form, population, and outcome. 288L-Theanine + Magnesium Glycinate
L-Theanine + Magnesium Glycinate combines multiple active materials; evidence on individual components cannot establish the effect of the finished formula.No ingredient guides match these filters.
Educational content only — not medical advice. These statements have not been evaluated by the Food and Drug Administration.
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