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.
289
L-Threonine
L-Threonine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 290L-Tryptophan
Studies of L-Tryptophan examine sleep quality and mood-related measures, but results and practical relevance vary by form, population, and outcome. 291L-Tyrosine
Studies of L-Tyrosine examine cognitive performance during stress, cold, or sleep loss, but results and practical relevance vary by form, population, and outcome. 292L-Valine
L-Valine is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 293Lactoferrin
Studies of Lactoferrin examine iron status, immune measures, and gut function, but results and practical relevance vary by form, population, and outcome. 294Lavender
Lavender is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 295Lecithin
Lecithin is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 296Lemon Balm Tincture
Studies of Lemon Balm Tincture examine stress, sleep, and digestive-comfort measures, but results and practical relevance vary by form, population, and outcome. 297Lemongrass
Lemongrass is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 298Licorice Root
Licorice Root is studied for digestive and respiratory-comfort measures, although direct human evidence remains limited and product forms are not interchangeable. 299Linolenic Acid Term
Linolenic Acid Term is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 300Lion's Mane
Lion's Mane is studied for cognitive, mood, and nerve-growth-related measures, although direct human evidence remains limited and product forms are not interchangeable. 301Lipase
Lipase is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 302Lithium Orotate
Lithium Orotate is marketed for mood-related outcomes, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 303Lobelia
Lobelia is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 304Longan Fruit
Longan Fruit is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 305Lotus
Lotus is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 306Lumbrokinase
Lumbrokinase is marketed for blood-flow and clotting-related laboratory measures, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 307Lutein
Lutein is studied for macular-pigment and visual-function measures; evidence and product identity depend on the exact form, preparation, and measured outcome. 308Lutein Zeaxanthin Complex
Lutein Zeaxanthin Complex combines multiple active materials; evidence on individual components cannot establish the effect of the finished formula. 309Luteolin
Luteolin is marketed for inflammatory and cognitive biomarkers, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 310Lycopene
Lycopene is studied for oxidative-status, cardiovascular, skin, and prostate-related biomarkers; evidence and product identity depend on the exact form, preparation, and measured outcome. 311Maca Root
Studies of Maca Root examine sexual function, energy, and mood-related measures, but results and practical relevance vary by form, population, and outcome. 312Macadamia Nut Oil
Macadamia Nut Oil is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 313Magnesium
Magnesium is best understood by separating its established physiological role from claims about benefits of additional supplementation. 314Magnesium Chloride
Magnesium Chloride is best understood by separating its established physiological role from claims about benefits of additional supplementation. 315Magnesium Citrate
Magnesium Citrate is best understood by separating its established physiological role from claims about benefits of additional supplementation. 316Magnesium Glycinate
Magnesium Glycinate is studied for magnesium adequacy, tolerance, and sleep-related measures, although direct human evidence remains limited and product forms are not interchangeable. 317Magnesium Glycinate Malate Taurate
Magnesium Glycinate Malate Taurate combines multiple active materials; evidence on individual components cannot establish the effect of the finished formula. 318Magnesium L-Threonate
Magnesium L-Threonate is studied for cognitive function and magnesium status, although direct human evidence remains limited and product forms are not interchangeable. 319Magnesium Malate
Magnesium Malate is marketed for magnesium adequacy and energy-related measures, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 320Magnesium Taurate
Magnesium Taurate is marketed for magnesium adequacy and cardiovascular measures, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 321Maitake Mushroom
Maitake Mushroom is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 322Manganese
Manganese is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 323Mangosteen
Mangosteen is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 324Manuka Honey
Manuka Honey is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 325Marigold Extract
Marigold Extract is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 326Marine Collagen
Marine Collagen is studied for skin and connective-tissue measures, although direct human evidence remains limited and product forms are not interchangeable. 327Marshmallow Root
Marshmallow Root is marketed for throat and digestive-comfort measures, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 328Mastic Gum
Mastic Gum is studied for upper-digestive comfort and microbial measures, although direct human evidence remains limited and product forms are not interchangeable. 329MCT Oil
MCT Oil is studied for ketone production, energy intake, satiety, and cognitive measures; evidence and product identity depend on the exact form, preparation, and measured outcome. 330Melatonin
Research on Melatonin is strongest for specific measured outcomes related to sleep onset, circadian timing, and jet-lag measures; form, amount, and study context still matter. 331Melatonin + L-Theanine
Melatonin + L-Theanine combines multiple active materials; evidence on individual components cannot establish the effect of the finished formula. 332Meshima Mushroom
Meshima Mushroom is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 333Milk Thistle
Studies of Milk Thistle examine liver-enzyme and metabolic measures, but results and practical relevance vary by form, population, and outcome. 334Monk Fruit
Monk Fruit is documented here by identity, form, human-evidence context, and safety—not by marketing claims. 335Monolaurin
Monolaurin is marketed for microbial and immune-related measures, but reliable direct human evidence is not yet sufficient to support a clear conclusion. 336Moringa
Moringa is studied for glucose, lipid, and nutrient-intake measures, although direct human evidence remains limited and product forms are not interchangeable.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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