About the Product
P-Synephrine 60 mg from HSN's EssentialSeries is a food supplement in vegetable capsules based on bitter orange extract (Citrus aurantium) standardised to 30% p-synephrine, enriched with Zinc (citrate) and Chromium (picolinate). Each capsule provides 60 mg of pure p-synephrine, double the amount provided by most alternatives available on the market (typically 30 mg/capsule), positioning HSN's P-Synephrine 60 mg as one of the most concentrated formulations available in food supplementation. P-synephrine is the main alkaloid of bitter orange (Citrus aurantium), used for centuries in traditional Chinese medicine under the name "Zhi Shi," and gained particular popularity as an ingredient in natural thermogenics after ephedrine was banned in the US in 2004. Dose: 1 capsule per day, preferably on an empty stomach. Vegan, gluten-free, non-GMO, allergen-free.
Benefits
P-Synephrine: the selective β-3 adrenergic agonist with a superior cardiovascular safety profile to ephedrine: P-synephrine is a phenethylamine alkaloid naturally present in various Citrus species, with a particular concentration in immature Citrus aurantium (bitter orange) fruits. Its molecular structure is related to endogenous catecholamines (adrenaline and noradrenaline), but with distinct pharmacological properties: p-synephrine is a selective agonist of β-3 adrenergic receptors, with much lower affinity for α-1, α-2, and β-1 receptors compared to ephedrine. This selectivity is the central pharmacological point that distinguishes p-synephrine from previous formulas with ephedrine: β-3 receptors are mainly present in white adipose tissue and are the mediators of lipolysis (mobilization of triglycerides from adipocytes into circulation as free fatty acids), while β-1 receptors (which ephedrine extensively activates) are the main cardiac receptors responsible for increasing heart rate and blood pressure. P-synephrine's β-3 selectivity gives it a much more favorable cardiovascular safety profile, with studies documenting no effects on heart rate and blood pressure at doses up to 100 mg.
60 mg per capsule: double the most common dose on the market, with only 1 capsule/day: The 60 mg dose of p-synephrine per capsule is specifically relevant because it corresponds to the dose used in reference studies that documented the effects of p-synephrine on fat oxidation during exercise. The study by Gutiérrez-Hellín & Del Coso (2016), published in the British Journal of Clinical Pharmacology, with an acute p-synephrine dose equivalent to 2-3 mg/kg body weight (which for a 70 kg adult corresponds to 140-210 mg, a higher dose than 60 mg/capsule), documented significant increases in fat oxidation rate during exercise without effects on heart rate. The study by Ratamess et al. (2016), published in the Journal of the American College of Nutrition, documented that the combination of p-synephrine with caffeine increased metabolic and lipolytic responses during resistance training compared to p-synephrine or caffeine used alone, establishing the p-synephrine + caffeine synergy as one of the most evidence-supported combinations in thermogenics.
Documented mechanisms of action: lipolysis, thermogenesis, and appetite suppression: P-synephrine exerts its effects in the context of body weight management through three main mechanisms. Adrenergic lipolysis occurs through the activation of β-3 receptors in adipose tissue, which stimulates hormone-sensitive lipase (HSL) to hydrolyze triglycerides from adipocytes, releasing free fatty acids and glycerol into circulation. These fatty acids become available as a substrate for mitochondrial oxidation in muscles during exercise. Thermogenesis results from the increased sympathetic tone mediated by the activation of adrenergic receptors, with an increase in basal metabolism and body temperature. Appetite suppression, documented in some studies, may result from the activation of the sympathetic system (which typically inhibits gastrointestinal motility and reduces appetite) and direct effects on appetite regulation centers in the hypothalamus.
Zinc (zinc citrate): essential mineral with EFSA health claim for fatty acid metabolism: The Zinc included in the formula has an approved EFSA health claim specifically relevant in the context of this product: Zinc contributes to normal fatty acid metabolism. This function of Zinc in lipid metabolism is mediated by its participation as a cofactor for multiple enzymes in fatty acid oxidation and synthesis pathways. The combination of p-synephrine (which mobilizes fatty acids from adipose tissue) with Zinc (which supports normal fatty acid metabolism in mitochondria) creates a logically coherent nutritional synergy.
Chromium (chromium picolinate): support for carbohydrate metabolism and maintenance of normal blood glucose: Chromium has approved EFSA health claims that are especially relevant in contexts of caloric deficit and body definition: Chromium contributes to normal macronutrient metabolism and to the maintenance of normal blood glucose levels. In contexts of caloric deficit, maintaining stable blood glucose levels is important to avoid hunger spikes and functional hypoglycemia that can compromise adherence to the eating plan. Chromium picolinate is the form of Chromium with the highest oral bioavailability, enhancing insulin signaling and improving cellular sensitivity to insulin.
100% natural origin of p-synephrine: directly from Citrus aurantium fruit: The p-synephrine used by HSN is exclusively of natural origin, extracted from Citrus aurantium fruit (it is not synthetic p-synephrine). This clarity of origin is relevant given that the supplement market has products with synthetic p-synephrine that may have different ratios between d- and l-synephrine enantiomers, with potentially distinct pharmacological profiles. The 20:1 Citrus aurantium extract standardised to 30% natural p-synephrine guarantees a complete phytochemical profile that includes, in addition to p-synephrine, other natural alkaloids of bitter orange (octopamine, N-methyltyramine) with minor synergistic properties.
Uses
Recommended dose: Take 1 capsule daily, preferably on an empty stomach (30 minutes before the first meal or workout). Taking it on an empty stomach maximizes the absorption rate and bioavailability of p-synephrine, which is rapidly absorbed and reaches peak plasma levels 60 to 90 minutes after ingestion.
Synergy with caffeine and EGCG: To maximize lipotropic effects during exercise, p-synephrine can be combined with caffeine and EGCG (green tea), which have complementary mechanisms of action and documented synergy. Caffeine inhibits phosphodiesterase (increasing cAMP and prolonging adrenergic signaling), EGCG inhibits COMT (prolonging the half-life of catecholamines), and p-synephrine directly activates β-3 adrenergic receptors. This triad forms the basis of the most well-documented natural thermogenics.
