About the Product
HSN RawSeries's Inositol Powder is a supplement made of 100% pure Myo-Inositol powder, without any additives, sweeteners, flavorings, or excipients — just inositol in its most studied and biologically active form. HSN explicitly states that it uses the Myo-Inositol stereoisomeric configuration (the isomer that accounts for >90% of inositol studied in scientific literature) instead of unspecified isomers, as is the case with most inositol products on the market. Recommended dose: 1500mg/day. Vegan. Gluten-free. Allergen-free. 100% pure.
Ingredient: Myo-Inositol (100% pure). No other ingredients.
Benefits
What is Inositol and why Myo-Inositol is the relevant isomer:
Inositol (cyclohexane-1,2,3,4,5,6-hexol) is a cyclic 6-carbon polyol with 9 possible stereoisomeric configurations (epimers), of which Myo-Inositol is the most abundant in human tissues (>90% of total body inositol) and the most clinically studied. Myo-Inositol is not technically a vitamin (the body can synthesize it from glucose-6-phosphate by inositol-3-phosphate synthase), but it is classically included in the B vitamin group (B7 or B8 in some old classifications) for its function as a second messenger in multiple cellular signaling systems. It is the precursor of phosphatidylinositol (PI, the main signaling phospholipid of cell membranes) and phosphoinositides (PIP, PIP2, PIP3 — the second-line lipid messengers of multiple signaling pathways including the insulin pathway, PI3-kinase, and mTOR). HSN Inositol Powder ensures that you are consuming the correct and most studied form of inositol, eliminating the ambiguity that exists when other products simply state "inositol" without specifying the isomer.
Insulin signaling and insulin sensitivity: the central mechanism of Myo-Inositol:
The most documented mechanism of action of Myo-Inositol in clinical studies is its involvement in the insulin signaling pathway. Myo-Inositol is the starting substrate for the synthesis of IPG (inositol phosphoglycan) — a second messenger that is released from the cell membrane in response to insulin and intracellularly activates pyruvate dehydrogenase phosphatase and other enzymes involved in glucose and fatty acid metabolism. In conditions of insulin resistance (such as Polycystic Ovary Syndrome — PCOS, type 2 diabetes, and pre-diabetes), IPG synthesis and signaling are compromised, and Myo-Inositol supplementation can partially restore insulin sensitivity by providing the starting substrate for IPG synthesis. The meta-analysis by Unfer et al. (2016), published in the International Journal of Endocrinology with data from 13 randomized clinical trials in women with PCOS, documented that Myo-Inositol supplementation significantly improved insulin sensitivity, hormonal profile (reduction of androgens), menstrual regularity, and fertility parameters compared to placebo.
Polycystic Ovary Syndrome (PCOS): the clinical use with the most evidence for Myo-Inositol:
PCOS (Polycystic Ovary Syndrome) is the most prevalent endocrinopathy in women of reproductive age (affecting 5 to 10% of women), characterized by insulin resistance, hyperandrogenism (excess androgens), chronic anovulation, and polycystic ovaries on ultrasound. Myo-Inositol is currently the supplement with the most clinical evidence for the nutritional management of PCOS — multiple randomized clinical trials have documented that 2000mg to 4000mg/day of Myo-Inositol improve menstrual regularity, reduce serum androgens (free testosterone, androstenedione), improve oocyte and embryo quality, reduce insulin resistance, and improve lipid profile. The standard recommendation in scientific literature is the combination of Myo-Inositol with D-Chiro-Inositol in a 40:1 ratio (the ratio that best mimics the physiological plasma concentrations of the two isomers), but pure Myo-Inositol (like HSN's Inositol Powder) is effective standalone at doses of 2000 to 4000mg/day.
Mental health: anxiety, depression, and OCD:
Inositol has a second well-documented axis of action in clinical studies: mental health. Myo-Inositol is a second messenger of the serotonergic and dopaminergic systems — it is the substrate of the phosphoinositol cycle in neurons, which mediates the intracellular response of serotonin 5-HT2 receptors, muscarinic receptors, and other GPCRs (G protein-coupled receptors). Deficits in the phosphoinositol cycle have been proposed as a contributing mechanism to depression, anxiety, and Obsessive-Compulsive Disorder (OCD). Multiple clinical trials with high doses of Myo-Inositol (12 to 18g/day, much higher than the HSN dose of 1500mg) have documented effects comparable to fluvoxamine in OCD, alprazolam in panic, and fluoxetine in depression — with a lower incidence of side effects. HSN's 1500mg/day dose is a preventive and supportive dose for serotonergic signaling balance; for more pronounced therapeutic effects on mental health, doses of 6 to 18g/day are documented in trials.
Metabolic and liver health: the role of Inositol in hepatic fat metabolism:
As already described in the sections on Inositol included as an ingredient in Marvelous Nutrition's Alive, Amputation (Marvelous), and Vitamin (Marvelous), Inositol is an essential structural component of hepatocyte membrane phospholipids (phosphatidylinositol) and is necessary for the liver's export of triglycerides via VLDL. Inositol deficiency (along with choline deficiency) is associated with non-alcoholic fatty liver disease (NAFLD) — the excess of triglycerides in the liver resulting from the inability to export them via VLDL due to a lack of phosphatidylinositol and phosphatidylcholine. For athletes on hypocaloric diets rich in fat (ketogenic, low-carb) or with high occasional alcohol consumption, inositol support is relevant for liver health.
1500mg/day: HSN's reference dose based on the most robust studies:
HSN clearly states that the recommended dose is 1500mg/day of pure Myo-Inositol — based on insulin sensitivity and PCOS studies that used doses of 1000 to 2000mg/day as the minimum effective dose. This dose transparency is another differentiator for HSN compared to products that do not specify the dose or use doses below documented efficacy.
Uses
Recommended dose: Dissolve 1500mg (check included scoop) in 200 to 300ml of water, juice, or any beverage. Can be added to protein shakes or smoothies without interfering with absorption. Consume once a day, preferably with breakfast. For use in PCOS or as female hormonal support, the dose can be increased to 2000 to 4000mg/day (2 to 3 doses) — consult a healthcare professional. Inositol Powder has a virtually neutral taste and dissolves easily in cold water.
