Tianyi Health Tech
DHM 98% · HPLC-tested · From vine tea
Tianyi Health Tech supplies bulk dihydromyricetin (DHM, also known as DMY or ampelopsin) powder to supplement brands, private-label manufacturers and functional beverage companies. Our 98% DHM (HPLC) is extracted from the young leaves of vine tea (Ampelopsis grossedentata) grown in Hunan, and is supplied with batch COA and OEM/ODM support.
Specification
| Parameter | Typical specification | Method |
|---|---|---|
| Identity | ||
| Product name | Dihydromyricetin (DHM) | |
| Synonyms | DMY; ampelopsin; dihydromyricin | |
| CAS No. | 27200-12-0 | |
| Molecular formula / weight | C15H12O8 / 320.25 g/mol | |
| Botanical source | Ampelopsis grossedentata (vine tea), young leaves | |
| Origin | Hunan, China | |
| Specification | ||
| Assay (DHM) | NLT 98% | HPLC |
| Appearance | White, fine powder | Visual / organoleptic |
| Loss on drying | NMT 5% | 105 °C, 4 h |
| Ash | NMT 5% | 525 °C, 3 h |
| Particle size | 100% pass 80 mesh | Sieve |
| Residual solvents | ≤ 0.5% | GC |
| Contaminants and microbiology | ||
| Heavy metals (total) | ≤ 10 mg/kg | AAS |
| Lead (Pb) / Arsenic (As) | ≤ 2.0 / ≤ 1.0 mg/kg | AAS |
| Mercury (Hg) / Cadmium (Cd) | ≤ 1.0 / ≤ 1.0 mg/kg | AAS |
| Total plate count | ≤ 1,000 cfu/g | Pharmacopoeia method |
| Yeast and mold | ≤ 100 cfu/g | Pharmacopoeia method |
| Salmonella / E. coli | Negative / Negative | Pharmacopoeia method |
| Aflatoxin B1 | ≤ 5.0 µg/kg | Pharmacopoeia method |
| Pesticide residues (BHC, DDT, PCNB / aldrin) | ≤ 0.10 / ≤ 0.02 mg/kg | Pharmacopoeia method |
| Physical and handling data | ||
| Bulk / tapped density | About 0.25 g/mL / 0.34 g/mL | |
| Capsule fill | About 0.32 g DHM per size 00# capsule (0.95 mL) | |
| Solubility | Easily soluble in hot water; much lower at room temperature | |
| Stability | Stable in neutral and slightly acidic conditions; avoid temperatures above 100 °C (irreversible oxidation) | |
| Supply | ||
| Packaging | 1–5 kg: inner sealed bag, outer foil bag, carton. Above 5 kg: inner double PE bag in a paper/fibre drum | |
| Shelf life / storage | 2 years in original unopened packaging; ventilated, dry place away from direct sunlight and heat | |
| Documents | Specification sheet, batch COA and technical documents on request | |
Values are typical specification limits. The batch COA supplied with each order prevails. Looking for a lower-purity total-flavonoid grade? See vine tea extract.
Overview
Dihydromyricetin (DHM) is a dihydroflavonol found in vine tea, the leaves of Ampelopsis grossedentata. It also appears in the literature as DMY, ampelopsin and dihydromyricin, and is registered under CAS 27200-12-0. Young vine tea leaves are unusually rich in it, with reported contents of up to 20–30%, which is why vine tea is the practical commercial source. To buy the whole-leaf flavonoid extract instead of the purified compound, see our vine tea extract, or compare both grades in our formulator guide: Dihydromyricetin (DHM) vs Vine Tea Extract: Differences, Specifications and Sourcing.
Our DHM is purified by repeated crystallization to a specification of at least 98% by HPLC (detection at 291 nm), giving a white powder that is easy to standardize in capsules, stick packs and powdered drink mixes.
Scientific advisor. Our vine tea program is advised by Dr. Zhang Yousheng, research fellow, author of Vine Tea Science and chief research expert for Zhangjiajie vine tea (mei cha).
Research
DHM is one of the most studied vine tea constituents. Published research, mostly preclinical, has examined its antioxidant behavior, its interaction with neurotransmitter receptors, and its role in liver lipid and ethanol metabolism pathways. The references below are provided for R&D reference only. They describe research and are not claims about our product.
Selected references
Formulation guide
DHM behaves differently from most plant extracts, so a few handling facts save weeks of trial and error. The notes below come from our own physical data and are a starting point for your lab work.
DHM is easily soluble in hot water and much less soluble at room temperature. For beverages and liquid concentrates, dissolve in hot water first, then cool and blend into the base. For cold-mix powdered drinks, plan for dispersion rather than full dissolution and test the finished texture.
DHM is stable under neutral and slightly acidic conditions and has good thermal stability, but above 100 °C it oxidizes irreversibly. Keep processing below boiling and avoid long hot holds. Validate pH, light and shelf-life stability in your own matrix.
About 0.32 g of DHM fills one size 00# capsule (0.95 mL), so a 300 mg-class serving fits in one capsule without much excipient. Our powder is light (bulk about 0.25 g/mL, tapped about 0.34 g/mL), so check flow and tamping on your filling line.
100% of the powder passes 80 mesh, which suits dry blending with sweeteners, acids and flavors.
Dose design. Finished supplements are commonly formulated at around 300 mg per serving. Final dose, labeling and any wording must follow the rules of your target market and your own substantiation. We can share the technical data we hold to support your regulatory review.
Process
Purification relies on repeated crystallization. Residual solvents are specified at 0.5% or less and tested by GC.
OEM / ODM
Why Tianyi
A Hunan vine tea supply base and a scientific advisor who wrote the textbook on vine tea, Vine Tea Science.
Specification sheet and batch COA on request, with HPLC assay, heavy metals, microbiology and residual solvents.
A named export contact, replies within 24 hours, and formulation guidance on dissolving and stabilizing DHM.
Buy DHM 98% here, or the whole-leaf vine tea extract if you need a total-flavonoid profile.
Quality
Each batch is tested for DHM assay by HPLC, loss on drying, ash, particle size, residual solvents, heavy metals (AAS), microorganisms, aflatoxin B1 and selected pesticide residues, as listed in the specification above. A batch COA is available on request, and the HPLC chromatogram can be shared with the COA.
Company-level credentials and partner certificates are listed on our Quality & Certifications page.
More ingredients
FAQ
Yes. Dihydromyricetin (DHM), DMY, ampelopsin and dihydromyricin are names for the same dihydroflavonol (CAS 27200-12-0). Buyers and formulators use them interchangeably; please use whichever term your documentation requires and we will match it on the COA.
Our standard grade is DHM 98% (HPLC), a white fine powder. Assay is specified as not less than 98%. For a lower-purity total-flavonoid grade, see our vine tea extract, or compare specifications and formulations in our DHM vs vine tea extract guide.
DHM is easily soluble in hot water and much less soluble at room temperature, so dissolve it in hot water (below 100 °C) and then cool or blend into your base. DHM is stable in neutral and slightly acidic conditions, but above 100 °C irreversible oxidation occurs, so avoid prolonged boiling. Always validate stability in your own matrix and pH.
One size 00# capsule (0.95 mL) holds about 0.32 g of our DHM powder. Bulk density is about 0.25 g/mL and tapped density about 0.34 g/mL, which is lighter than many botanical powders, so allow for this when sizing capsules, drums and shipments.
Yes. A batch COA and a specification sheet are available on request, and samples can be arranged for formulation and lab testing. Use the quote form or email us and we reply within 24 hours.
1–5 kg: sealed inner bag in a foil bag, packed in a carton. Above 5 kg: double PE inner bag in a paper/fibre drum. Shelf life is 2 years in unopened original packaging, stored dry and ventilated, away from direct sunlight and heat.
Regulatory status varies by market and by intended use (for example, new dietary ingredient considerations in the US and novel food assessment in the EU). We provide technical documentation, but the brand is responsible for confirming compliance and labeling in its target market.
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Last updated: 13 October 2026
Research and clinical information is provided for R&D and B2B reference only. These statements have not been evaluated by the Food and Drug Administration. Our ingredients are not intended to diagnose, treat, cure or prevent any disease. Final specifications and regulatory status are confirmed per commercial agreement.
