Selenium
Compiled from published pharmacological and botanical literature. Not independently verified by Herbuno. Spotted an error or have a correction? Flag it below →
| Compound Class | Essential trace element; incorporated into selenoproteins as selenocysteine |
| Botanical Source | Mustard seed (Brassica spp.) — brassicas accumulate selenium in organic forms |
| Plant Part | Seed |
| Standardisation | 2500 ppm (0.25%) elemental selenium by ICP-MS |
| Comparator Forms | Sodium selenite and selenate (inorganic); L-selenomethionine; high-selenium yeast |
| Solubility / Format | Fine powder; ppm-level potency requires dilution and rigorous blend uniformity control |
| Regulatory Note | Established NRV and authorised EU health claims; narrow margin between adequate intake and the tolerable upper level |
| Buy from Herbuno | Mustard Seed 2500 ppm |
| Origin | Processed / Sourced from India |
| MOQ | R&D 100 g / 250 g (subject to stock) · Pilot batch 1–5 kg · Bulk 10 kg, 25 kg and above |
| Lead Time | Dispatch within 72 hrs from stock · fresh-batch production (typically 50 kg+): 10 working days |
| Documentation | CoA & MSDS standard with every lot; phytosanitary on request |
Name origin: Berzelius isolated selenium in 1817 and named it for Selene, the Greek moon goddess, to pair it with the previously identified tellurium, named for the earth. For its first century and a half selenium was known principally as a toxin — livestock alkali disease in the American West was traced to selenium accumulation in forage plants — and it was only in 1957 that its essentiality was established, making it one of the few elements recognised as poisonous long before it was recognised as necessary.
Traditional use: Selenium has no traditional-medicine record, since its deficiency diseases were not linked to the element until the twentieth century. Mustard seed, however, carries a long independent record across Ayurvedic, European and Chinese practice, used both as a condiment and as a counter-irritant in poultices, and it remains a staple oilseed and spice crop across northern India. Its selenium content reflects the brassica family's characteristic capacity to accumulate the element from soil, not a traditional understanding of it.
Research trajectory: Selenium research was reoriented by two discoveries: that Keshan disease, a cardiomyopathy endemic to selenium-poor regions of China, responds to selenium supplementation, and that selenium functions through genuine selenoproteins containing selenocysteine rather than as a loose antioxidant cofactor. Interest then surged around cancer prevention, and largely receded when major intervention trials failed to confirm benefit in selenium-replete populations — a pattern that turns out to be central to interpreting the whole literature.
Commercial source: Supplemental selenium is supplied as inorganic salts, as L-selenomethionine, or as high-selenium yeast. Plant-derived selenium from brassicas is a distinct category in which the element is present in organic forms — principally selenomethionine and Se-methylselenocysteine — within the seed matrix. The organic-versus-inorganic distinction is not cosmetic here; it has measurable consequences, which is unusual among mineral form debates.
Evidence for Selenium Applications
Selenium's function is structurally specific rather than diffusely antioxidant: it is incorporated as selenocysteine into some twenty-five human selenoproteins, including the glutathione peroxidases, thioredoxin reductases and selenoprotein P. This is why selenium status is assessed through selenoprotein expression rather than through generic antioxidant markers, and why the form supplied matters to how the element is handled. Claim strength: High.
The form comparison is unusually well evidenced for a mineral. In a supplementation trial in a low-selenium area of China, full expression of plasma glutathione peroxidase was achieved with 37 µg Se/day as selenomethionine but required 66 µg/day as selenite — a difference the authors summarised as selenomethionine having nearly twice the bioavailability of selenite. [Xia 2005] For a plant-derived material carrying selenium predominantly in organic forms, this is the relevant comparison, and it favours the organic form on evidence rather than on assertion. Claim strength: High.
A second finding from the same work has broader implications: full expression of selenoprotein P required a greater intake than full expression of glutathione peroxidase, leading the authors to argue that selenoprotein P is the better status indicator and that the recommended dietary allowance, which was set using glutathione peroxidase, should be revised. [Xia 2005] Buyers evaluating selenium claims should note that the choice of biomarker materially changes the apparent adequacy of a given intake. Claim strength: Moderate.
Repletion status is the variable most often omitted from commercial claims, and it dominates. In a randomised high-dose trial in selenium-replete subjects given roughly 200 to 600 µg/day as selenite, high-selenium yeast or L-selenomethionine, selenomethionine and yeast raised plasma selenium dose-dependently while selenite did not — but neither glutathione peroxidase activity nor selenoprotein P concentration responded to supplementation at all. [Burk 2006] Urinary excretion was greater after selenomethionine than selenite, indicating better absorption. [Burk 2006] The practical reading is that in already-replete individuals, raising plasma selenium is not the same as raising selenoprotein function. Claim strength: High.
Selenium is also the mineral where the gap between adequacy and excess is narrowest, and this deserves more prominence than it usually receives in supplier material. Chronic excessive intake causes selenosis, with hair and nail brittleness and loss among the characteristic signs, and tolerable upper intake levels are correspondingly low relative to the recommended intake. For a ppm-potency raw material this converts directly into a manufacturing control problem: blend uniformity failures at this concentration have real safety consequences, not merely label-claim consequences. Claim strength: High.
Sourcing selenium from mustard seed: A 2500 ppm selenium concentrate from Brassica seed is available from Herbuno, assayed by ICP-MS, with CoA and MSDS on every lot. View Selenium 2500 ppm (Mustard Seed) →
Dosage & Formulator Specification
Production route. Selenium-accumulating Brassica seed material is processed and concentrated to a defined 2500 ppm elemental selenium specification. Because brassicas take selenium up from soil, the selenium content of the agricultural input is intrinsically variable with growing region and season, which makes lot-to-lot assay and blending to specification a core part of production rather than an afterthought. Species and cultivar also affect the balance between selenomethionine and Se-methylselenocysteine in the final material.
Analytical standardisation. Total elemental selenium is determined by ICP-MS following acid digestion, and 2500 ppm equates to 0.25% by weight. For an organic-selenium material, speciation analysis distinguishing selenomethionine, Se-methylselenocysteine and any inorganic selenium is a meaningful supplementary specification, because the form determines both bioavailability and metabolic handling — a total-selenium figure alone does not tell you what you are buying. Specify the assay method and, where the organic-form claim is commercially load-bearing, request speciation data.
Regulatory and handling context. Selenium has an established Nutrient Reference Value in the EU and authorised health claims covering normal thyroid function, normal immune function, protection of cells from oxidative stress, and maintenance of normal hair and nails. Tolerable upper intake levels are set by EFSA and the US Institute of Medicine and are low in absolute terms, so total intake across a multi-product regimen requires attention. This is a material where over-delivery is a genuine safety matter rather than a compliance technicality. Store cool and dry in sealed, clearly identified containers.
Formulation behaviour. At 2500 ppm, delivering a 55 µg dose requires 22 mg of material — a small inclusion that makes blend uniformity the critical control point. Pre-dilution into a carrier through a validated geometric dilution sequence is strongly recommended over direct addition, and content uniformity should be verified analytically rather than assumed from mixer time. The material suits tablets, capsules and dry blends. Segregation during handling and transfer is the principal practical risk, so specify and validate the transfer steps as carefully as the mixing step.
Frequently Asked Questions — Selenium
On the evidence, organic selenium forms are better absorbed than inorganic selenite. In a low-selenium population, full expression of plasma glutathione peroxidase required 37 micrograms per day as selenomethionine versus 66 micrograms per day as selenite, and a separate high-dose trial found greater urinary excretion after selenomethionine, indicating better absorption. Brassica-derived selenium is present predominantly in organic forms, so this comparison is the relevant one.
The evidence suggests much less than marketing implies. In selenium-replete subjects given 200 to 600 micrograms per day, selenomethionine and high-selenium yeast raised plasma selenium dose-dependently, but neither glutathione peroxidase activity nor selenoprotein P concentration responded at all. Raising plasma selenium in a replete individual is not the same as raising selenoprotein function, and this distinction should inform how a finished product is positioned.
Narrower than for most minerals, which is why we raise it directly. Tolerable upper intake levels for selenium are low in absolute terms relative to recommended intake, and chronic excess causes selenosis, with brittleness and loss of hair and nails among the characteristic signs. Total intake across a multi-product regimen needs attention, and accurate dosing in manufacture is a safety control rather than only a label-claim control.
Delivering a 55 microgram dose requires approximately 22 mg of material, so blend uniformity is the critical control point. We recommend pre-dilution into a carrier using a validated geometric dilution sequence rather than direct addition to a large batch, with content uniformity verified analytically rather than inferred from mixing time. Segregation during transfer operations is the main practical risk and those steps should be validated too.
Yes, if the organic-form claim matters commercially. Total elemental selenium by ICP-MS tells you how much selenium is present but not in what form, and form determines bioavailability and metabolic handling. Speciation analysis distinguishing selenomethionine, Se-methylselenocysteine and inorganic selenium substantiates an organic-selenium position. We can provide speciation data on request.
Every lot ships with a Certificate of Analysis and MSDS as standard, with phytosanitary certification on request. R&D quantities are available at 100 g and 250 g subject to stock, pilot batches at 1–5 kg, and bulk at 10 kg, 25 kg and above. Stock orders dispatch within 72 hours; fresh-batch production, typically 50 kg and above, runs to about 10 working days. Material is processed and sourced in India. Because soil selenium varies by growing region, we assay and blend to specification lot by lot.
Related compounds: Zinc · Vitamin E · Vitamin C
Claim strength scale: High — consistent human data or established biochemistry. Moderate — supportive human data with limitations. Emerging — mechanistic or preliminary evidence only.