THE VANGUARD BLOG
Physician-curated deep dives into the science of men's health optimization.
Monograph
Overview Alpha-linolenic acid (ALA) is an 18-carbon, plant-derived omega-3 fatty acid (18:3n-3) and the only truly essential omega-3—meaning humans cannot synthesize it and must obtain it from diet. It is abundant in flaxseed, chia seeds, walnuts, hemp seeds, and canola oil. ALA is a metabolic…
13 May 2026
Monograph
Overview Gamma-linolenic acid (GLA) is an 18-carbon omega-6 fatty acid with 3 double bonds (18:3n-6) that represents the first elongation/desaturation step downstream of linoleic acid (LA). Unlike the pro-inflammatory arachidonic acid (AA) pathway that dominates most omega-6 metabolism, GLA is…
13 May 2026
Monograph
Overview Eicosapentaenoic acid (EPA) is a long-chain omega-3 polyunsaturated fatty acid (LC-PUFA) with a 20-carbon backbone and 5 double bonds (20:5n-3). It is one of the two primary bioactive marine omega-3s (alongside DHA), found in fatty fish, algae, and marine oils. EPA serves as the…
13 May 2026
Monograph
Overview Docosahexaenoic acid (DHA) is a 22-carbon omega-3 fatty acid with 6 double bonds (22:6n-3), the most structurally complex and biologically specialized of the long-chain omega-3 PUFAs. It is the dominant structural fatty acid in the brain (gray matter comprises ~40% DHA) and the retina…
13 May 2026
Monograph
Overview Medium-chain triglycerides (MCTs) are saturated fats with carbon chain lengths of 6–12 carbons: caproic acid (C6), caprylic acid (C8), capric acid (C10), and lauric acid (C12). Unlike long-chain triglycerides (LCTs), MCTs do not require bile salt emulsification for absorption, bypass…
13 May 2026
Monograph
Overview Krill oil is extracted from Euphausia superba, a small Antarctic crustacean that occupies a foundational position in the marine food web. Like fish oil, krill oil is rich in EPA and DHA, but it differs fundamentally in how these omega-3s are packaged: approximately 40–65% of krill oil…
13 May 2026
Monograph
Overview Plant sterols (phytosterols) and their saturated analogs, stanols (phytostanols), are naturally occurring structural components of plant cell membranes that are chemically similar to cholesterol—the key difference being a methyl or ethyl group at carbon-24. They occur naturally in…
13 May 2026
Monograph
Overview Phosphatidylinositol (PI) is a minor but functionally critical phospholipid found in all eukaryotic cell membranes, constituting approximately 10–15% of total membrane phospholipids. Unlike the structural role of phosphatidylcholine, PI and its phosphorylated derivatives…
13 May 2026
Monograph
Overview Phosphatidylcholine (PC) is the most abundant phospholipid in mammalian cell membranes, comprising approximately 30–50% of membrane phospholipids depending on cell type. It is the primary transport and storage form of choline in the diet (particularly from eggs, liver, and soy…
13 May 2026
Monograph
Overview Growth hormone secretagogues (GHS) are a class of compounds that stimulate endogenous growth hormone release from the anterior pituitary, in contrast to exogenous recombinant hGH (rhGH), which bypasses the pituitary entirely. They act through two distinct receptor pathways: GHRH…
13 May 2026
Monograph
Overview Estradiol (17β-estradiol, E2) is the primary and most potent endogenous estrogen in humans. It is a steroid hormone synthesized predominantly in the ovaries (in premenopausal women), the testes (in small amounts in men), the adrenal glands, adipose tissue, bone, brain, and vascular…
13 May 2026
Monograph
Overview Cabergoline (Dostinex®) is a long-acting, highly selective dopamine D2 and D3 receptor agonist derived from ergot alkaloids. It is FDA-approved for treatment of hyperprolactinemia — excess prolactin production, which suppresses the hypothalamic-pituitary-gonadal (HPG) axis, causing…
13 May 2026
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