L-Ergothioneine: Antioxidant Properties, Uses for Eyes and Brain, Dosage, and Side Effects
L-ergothioneine (often shortened to “ergothioneine” or “ET”) is a unique, diet-derived amino acid found in mushrooms and some beans. Humans do not synthesize it;...
Leuconostoc mesenteroides: Fermentation Roles, Proven Benefits, How to Use It, Dosage, and Risks
Leuconostoc mesenteroides is a lactic acid bacterium best known for shaping the flavor, texture, and safety of fermented foods such as kimchi, sauerkraut, and...
Leucovorin: Clinical Uses, Optimal Dosage in Cancer Care, Timing Strategies, and Safety Considerations
Leucovorin—also called folinic acid—is a reduced form of folate used as a rescue agent, chemotherapy modulator, and folate replacement in very specific medical settings....
Levocarnitine: Clinical Uses for Deficiency and Dialysis, Fertility Insights, Dosing, and Side Effects
Levocarnitine (L-carnitine) is a conditionally essential compound that shuttles long-chain fatty acids into mitochondria so your cells can turn fat into usable energy. Your...
Levothyroxine: Hypothyroidism Treatment Explained, Proper Use, Dose Adjustments, and Risks
Levothyroxine is a synthetic form of thyroxine (T4), the primary hormone your thyroid gland makes to set the pace of metabolism. When the thyroid...
L-Fucose: Health Benefits, Mechanisms, Medical Uses, Dosage, and Safety
L-fucose is a six-carbon deoxy sugar that your body uses to decorate thousands of proteins and lipids with “fucosylation” marks. Those tiny chemical tags...
L-Glutamic Acid: Uses for Brain Health and Gut Support, Recommended Dosage, and Side Effects
L-glutamic acid—often shortened to glutamate when it appears in its ionized form—is a conditionally nonessential amino acid central to how your body turns food...
L-Glutamine: Gut Health Support, Immune Function, Dosage Guidance, and Side Effects
L-glutamine is the most abundant free amino acid in human blood and muscle. Your body makes it, yet demand can outpace supply during heavy...
L-Glutathione: Proven Benefits, Optimal Dosage, Best Forms, and Side Effects
L-glutathione (often shortened to “glutathione” or “GSH”) is a small tripeptide that the body makes from glutamate, cysteine, and glycine. It works everywhere in...
L-Glycine: Sleep, Collagen Support, Dosage Guidelines, and Safety Explained
Glycine is the simplest amino acid—small, neutral, and everywhere in your body. It builds collagen, helps synthesize glutathione (your cell’s primary antioxidant), and serves...
L-Histidine: Metabolic Health, Skin Barrier Support, Dosing Strategies, and Side Effects
L-histidine is an essential amino acid with outsized impact for a small molecule. Beyond helping build proteins, it is a precursor to histamine (immune...
L-Hydroxyproline: Skin and Joint Support, Evidence, Daily Intake, and Side Effects
L-hydroxyproline (often shortened to “hydroxyproline”) is a collagen-specific amino acid that gives connective tissues—skin, tendons, cartilage, bone, and blood vessels—their tensile strength and resilience....
Lignan extract: Cardiometabolic Support, Evidence-Based Uses, Recommended Dosages, and Side Effects
Lignan extract concentrates a family of plant polyphenols—most famously the flaxseed lignan secoisolariciresinol diglucoside (SDG)—that the gut microbiome converts into “enterolignans” such as enterolactone...
Lignoceric acid: Skin Barrier Benefits, Ceramide Science, Practical Uses, Dosage Notes, and Side Effects
Lignoceric acid (also called tetracosanoic acid or C24:0) is a very long-chain saturated fatty acid that shows up in small amounts in many natural...
Ligusticum chuanxiong: Evidence-Based Benefits, Uses for Headaches and Menstrual Comfort, Dosage, and Side Effects
Ligusticum chuanxiong—often called chuanxiong or Szechuan lovage—is a classic herb in East Asian medicine used to “move blood,” calm headaches, and ease menstrual discomfort....
Ligusticum porteri: Traditional Respiratory Support, Evidence, Recommended Dosage, and Side Effects
Ligusticum porteri—better known as osha—has a long record of use in the Rocky Mountains and northern Mexico for seasonal respiratory complaints, throat and chest...