1. HPLC Assay & Potency Verification

Every batch is tested by HPLC against a USP reference standard to confirm ≥ 96.0% d-alpha-tocopheryl acid succinate and ≥ 1,210 IU/g potency (1 mg d-alpha-tocopheryl acid succinate ≡ 1.21 IU). The natural RRR stereoisomer configuration is documented on the batch-specific COA.

2. Melting Point & Physical Identity Control

Melting range 73–78°C verifies the crystalline succinate ester form, physically distinguishing the powder from liquid tocopherol oils. Loss on drying (≤ 0.5%) and residue on ignition (≤ 0.1%) are controlled per batch for powder quality and processability.

3. Elemental Impurity Screening & Certification

Heavy metals Pb ≤ 2 ppm and arsenic As ≤ 1 ppm are verified by elemental analysis. Produced in ISO-certified facilities with full HALAL and KOSHER documentation; batch-specific COA and MSDS are provided. The 36-month shelf life is supported by air-stable storage data in sealed, light-protected containers.

Succinate Ester — Solid Powder, Not Oil

The esterification of the phenolic hydroxyl group with succinic acid converts d-alpha-tocopherol from a viscous oil into a crystalline solid. The resulting succinate ester has a defined melting point (73–78°C) and exists as a free-flowing powder at ambient temperature — a physical form fundamentally different from liquid tocopherol concentrates and suitable for dry formulation processes including tablet compression and powder blending.

Air-Stable — No Nitrogen Protection Required

Unlike unesterified d-alpha-tocopherol, which requires nitrogen-flushed packaging to prevent oxidative degradation, the succinate ester is stable in air under normal storage conditions (≤ 25°C, protected from light). This stability is a direct consequence of the esterification — the phenolic hydroxyl group, the site of oxidative attack, is blocked by the succinate moiety.

1,210 IU/g — Highest Commercial Potency Among Dry Vitamin E Forms

At 1,210 IU per gram, d-alpha-tocopheryl succinate delivers the highest Vitamin E potency per unit mass among commercially available dry Vitamin E products — compared to approximately 1,000 IU/g for d-alpha-tocopheryl acetate powder and approximately 500 IU/g for mixed tocopherol powders. This means less excipient mass is introduced per IU of Vitamin E in finished formulations.

Non-Acidic — Compatible with Acid-Sensitive Formulations

The carboxylic acid group of the succinate moiety is free and un-ionized, but the compound is not acidic in the same manner as free organic acids. It does not significantly lower the pH of a tablet or powder blend, making it compatible with formulation matrices where free acidulants would be problematic.

FUNCTIONAL ROLES

1. Dietary Supplements — Tablets & Hard Capsules

The primary application — direct compression into Vitamin E tablets and filling into two-piece hard gelatin or HPMC capsules. The powder form and flow properties are specifically suited to these manufacturing processes, unlike liquid tocopherol oils which require softgel encapsulation.

2. Dry Powder Blends & Sachets

Incorporated into multi-ingredient powder blends, effervescent formulations, and single-serving powder sachets where a dry, free-flowing Vitamin E ingredient is required.

3. Food Fortification Premixes

Used in dry multi-vitamin premix systems for fortified powdered beverages, breakfast cereals, and formulated nutritional products.

4. Multi-Vitamin Tablets

Combined with other vitamin and mineral powders in multi-vitamin tablet formulations — the non-acidic nature is particularly relevant in formulations where ingredient compatibility is a concern.

Q1: How does d-alpha-tocopheryl succinate differ from d-alpha-tocopherol oil?

A: D-alpha-tocopherol oil is a viscous liquid that requires nitrogen-flushed packaging to prevent oxidation. D-alpha-tocopheryl succinate is the esterified form — a white crystalline powder produced by reacting d-alpha-tocopherol with succinic anhydride. The esterification blocks the phenolic hydroxyl group, making the compound air-stable as a solid powder. The two forms have different CAS numbers (59-02-9 for free tocopherol, 4345-03-3 for the succinate), different physical states, and are suited to different manufacturing processes — oil for softgels, succinate powder for tablets and hard capsules.

Q2: What does 1,210 IU/g mean, and how is it calculated?

A: 1,210 International Units per gram of powder. The United States Pharmacopeia defines 1 mg of d-alpha-tocopheryl acid succinate as equivalent to 1.21 IU of Vitamin E. At a minimum purity of 96%, the powder delivers at least 1,210 IU/g. This value is verified by HPLC assay against a reference standard, not by biological assay.

Q3: Does the succinate powder need special storage conditions?

A: Unlike d-alpha-tocopherol oil, the succinate ester does not require nitrogen-flushed packaging or refrigeration. Standard storage at ≤ 25°C in a sealed container protected from light is sufficient. The 36-month shelf life reflects the compound’s inherent air stability resulting from the blocked phenolic hydroxyl group.