Cola nitida (Kola Nut)

Cola nitida (Kola Nut) is notable for its high concentration of bioactive alkaloids rather than conventional macronutrient value. Alkaloids & Stimulants: Caffeine (2.0–3.5% dry weight, approximately 20–35 mg per gram of dried nut), theobromine (0.5–2.5%), and trace theophylline. These xanthine alkaloids are highly bioavailable when consumed orally, with caffeine reaching ~99% absorption. Polyphenols & Tannins: Contains catechins, epicatechins, and proanthocyanidins (condensed tannins) at approximately 5–10% dry weight; these contribute significant antioxidant capacity (ORAC values comparable to cacao). Kolatins and kolatin glycosides are unique phenolic compounds specific to Cola species. Carbohydrates: Starch content ranges from 30–45% dry weight; simple sugars (glucose, fructose) approximately 2–5%. Dietary fiber content is moderate at roughly 5–8%. Protein: Approximately 7–10% dry weight, containing essential amino acids though not considered a complete protein source. Lipids: Low fat content, roughly 1–3% dry weight, primarily composed of oleic and linoleic fatty acids. Minerals: Potassium (approximately 1,200–1,800 mg/100g dry weight), calcium (100–200 mg/100g), magnesium (150–250 mg/100g), phosphorus (200–400 mg/100g), iron (3–6 mg/100g, though bioavailability is reduced by tannin content), and zinc (1–3 mg/100g). Vitamins: Modest amounts of niacin (vitamin B3, ~1.5–2.5 mg/100g), riboflavin (B2), and trace ascorbic acid (vitamin C, largely degraded upon drying). Bioavailability Notes: The tannin content can chelate iron and other divalent minerals, reducing their absorption by 30–60%. Caffeine bioavailability is enhanced by the presence of kolanin (a caffeine-tannin complex) which provides a slower, sustained release compared to pure caffeine. Theobromine is absorbed more slowly than caffeine, contributing to a prolonged mild stimulant effect. The polyphenolic antioxidants have moderate bioavailability (~5–15%) that may be improved with concurrent fat intake.