Ren Shen (Panax ginseng)

Ren Shen (Panax ginseng) is valued primarily for its bioactive compounds rather than macronutrient content. Key constituents include: Ginsenosides (triterpenoid saponins): The principal active compounds, typically comprising 2–6% of dried root weight; over 40 individual ginsenosides identified, with Rb1, Rb2, Rc, Rd, Re, Rf, Rg1, and Rg2 being the most pharmacologically significant. Protopanaxadiol-type (e.g., Rb1 at ~3–8 mg/g, Rd at ~1–4 mg/g) and protopanaxatriol-type (e.g., Rg1 at ~2–6 mg/g, Re at ~2–5 mg/g) are the two major classifications. Polysaccharides (ginsenans): ~10–20% of dried root; acidic polysaccharides (e.g., ginsenan PA, ginsenan PB) exhibit immunomodulatory activity. Polyacetylenes: Panaxynol (falcarinol) and panaxydol, present at ~0.02–0.05% of dried root, contribute anti-inflammatory and anti-tumor properties. Peptides and proteins: Small bioactive peptides and lectins; crude protein content approximately 10–14% of dried weight. Lipids and fatty acids: ~1–2% of dried root, including linoleic acid, palmitic acid, and oleic acid. Vitamins: Contains modest amounts of B-group vitamins (B1 ~0.1–0.2 mg/100g, B2 ~0.1–0.3 mg/100g, B12 in trace amounts), vitamin C (~5–10 mg/100g dried root), and small quantities of fat-soluble vitamins. Minerals: Potassium (~1,200–1,800 mg/100g), calcium (~40–80 mg/100g), magnesium (~50–100 mg/100g), iron (~8–15 mg/100g), zinc (~3–7 mg/100g), manganese (~3–6 mg/100g), selenium (~0.01–0.05 mg/100g), and germanium (trace, ~0.002–0.004 mg/100g). Volatile oils: ~0.05–0.1%, containing sesquiterpenes (β-elemene, panasinsene) contributing to aroma and mild pharmacological effects. Amino acids: All essential amino acids present; arginine content notably high at ~1–2% of dried root. Dietary fiber: Approximately 15–25% of dried root. Carbohydrates: Total carbohydrates ~60–70% of dried root (including starch and polysaccharides). Phenolic compounds: Maltol, salicylic acid, vanillic acid, and p-coumaric acid in trace amounts, contributing antioxidant activity. Bioavailability notes: Ginsenosides have relatively low oral bioavailability (~1–5%) due to extensive metabolism by gut microbiota, which convert them into more bioactive metabolites such as compound K (from Rb1) and protopanaxatriol (from Rg1). Bioavailability is enhanced when taken with warm water on an empty stomach or when processed (red ginseng/steaming increases less-polar ginsenosides like Rg3, Rk1, and Rg5, which show improved absorption). Fermented ginseng products significantly increase compound K bioavailability. Polysaccharide bioavailability is influenced by molecular weight and degree of branching; lower-molecular-weight fractions are absorbed more readily. Co-administration with lipid-based carriers may improve polyacetylene absorption.