CHCalcifediol (25-hydroxyvitamin D3)In deficient postmenopausal women, monthly calcifediol lifted vitamin D above 30 ng/mL in 35 percent by month four, versus 8 percent.Fits Formulas and supervised protocols built around a vitamin D source that arrives already hydroxylated at carbon 25, so the liver step is not part of the chain. It suits monthly and weekly schedules rather than daily ones, work in older adults, and settings where hepatic hydroxylation capacity is a design consideration. Because the microgram dosing is unforgiving compared with international units, it fits programmes where the dose is set and checked by a clinician. In most markets its human use sits in a prescription-drug setting rather than a supplement one.
VDVitamin D3 from lanolinCholecalciferol, the same molecule human skin forms under UV light. Commercial supply begins with 7-dehydrocholesterol extracted from lanolin, the wax in sheep wool, which is UV-treated and purified into a crystalline concentrate. It is fat-soluble and oil-miscible, sold as a resin diluted in a carrier oil or spray-dried onto a powder matrix.Fits The workhorse cholecalciferol for softgels, oil drops, multivitamins and D3 plus K2 pairings. The concentrate is potent enough that a microgram dose occupies a fraction of a fill, it is stable in an oil base, it is inexpensive at scale, and supply is deep enough that a contract manufacturer can source it without a lead time conversation.Trade-off Lanolin is a sheep by-product, so this form carries a vegetarian declaration but never a vegan one, and brands aiming at plant-based shoppers switch to the lichen material. In the pooled trial data the difference between D3 and D2 held for bolus dosing and was not present when the two were given daily, so the form gap narrows on an everyday schedule.
VVVegan vitamin D3 from lichenCholecalciferol with the same structure as the lanolin-derived molecule, sourced from lichen, a symbiosis of a fungus and an alga that accumulates the sterol precursors. The extract arrives as an oil resin or a standardised dry powder, at a lower declared potency per gram than the lanolin concentrate, so the working fill weight is larger.Fits The only cholecalciferol source that supports a vegan certification, which makes it the default for plant-based ranges, vegan multivitamins, vegan D3 plus K2 formulas and any line that has to keep one animal-free claim across every SKU. It drops into the same oil and beadlet formats a formulator already uses for lanolin D3.Trade-off Ingredient cost per microgram is materially higher than the lanolin route and the raw material is more dilute, which lands either in capsule size or in retail price. No published human trial has compared lichen-sourced cholecalciferol with lanolin-sourced cholecalciferol, so the case rests on the two being the same molecule rather than on an outcome study.
VDVitamin D3 from fish liver oilCholecalciferol that occurs naturally in cod and other fish liver oils, carried in the oil alongside preformed vitamin A and the long-chain omega-3s EPA and DHA. Content varies with species, season and batch, so the oil is assayed and standardised to a declared amount per serving rather than trusted as-is.Fits Suits traditional cod liver oil products and omega-3 lines where the vitamin D is already present in the base the product is built on, so no separate excipient or premix is needed. It also supports a food-derived story on the panel, since the D is declared from a recognisable ingredient rather than an isolated concentrate.Trade-off The oil brings preformed vitamin A with the D, which matters when the rest of the formula already supplies retinol and constrains how far the serving can be pushed. It excludes vegan shoppers and anyone avoiding fish, it carries a marine odour that has to be managed, and batch variability means the vitamin D figure depends on standardisation rather than the raw oil.
VDVitamin D3 in an oil baseCholecalciferol dissolved in a carrier lipid, most often MCT from coconut, olive oil or high-oleic sunflower oil, then filled into a softgel or a dropper bottle. Vitamin D is fat-soluble, so an oil is its native solvent and the system needs no emulsifier or dispersing matrix. The finished liquid is usually standardised so one drop or one softgel carries the whole declared dose.Fits Suits drops for infants, for older shoppers and for anyone who does not swallow tablets, and it suits high declared potency in a very small fill because the active is a microgram-scale material. It is also the simplest label a brand can print for this vitamin, one active and one oil, and it pairs directly with fat-soluble partners such as vitamin K2 and vitamin A.Trade-off An oil base commits the product to a softgel or a glass dropper, which rules it out of tablets, gummies and dry stick packs, and a softgel brings its own gelatin or plant-capsule question. Liquids are sensitive to light and oxygen once opened, and drop dosing depends on the user holding the bottle at the angle the pipette was calibrated for.Active and formulation aid
VDVitamin D3 dry powderCholecalciferol emulsified into a protective matrix, typically modified food starch or acacia gum with an antioxidant such as tocopherols, then dried into free-flowing beadlets. The matrix makes an oil-soluble vitamin behave as a dry powder that disperses in water, and it shields the active from oxygen during blending and storage.Fits The form that makes tablets, two-piece capsules, gummies, powdered drink mixes, stick packs and food fortification possible, where a neat oil would wet the blend or bleed through a capsule shell. It is diluted to a workable potency so it blends uniformly at microgram inclusion, and it survives tablet compression, which the oil concentrate does not.Trade-off The carrier matrix adds excipient lines to the label, which matters to a brand selling a short ingredient list, and potency per gram is far below the oil concentrate so the beadlet takes up more of the fill. The beadlets are sensitive to moisture and to sustained heat in processing, so blending and storage conditions have to be controlled.Active and formulation aid
UTUV-treated mushroom powderDried mushroom powder, commonly Agaricus bisporus or shiitake, exposed to controlled UV light so ergosterol in the cell walls converts to ergocalciferol. The vitamin declared is D2, and the powder carries the mushroom's own fibre, beta-glucans and flavour along with it.Fits Suits whole-food and food-first positioning where a brand wants the vitamin D declared from a named ingredient rather than an isolated concentrate, and it is vegan and organic-certifiable by default. It sits naturally in mushroom blends, greens powders and food-based multivitamins that already carry a botanical base.Trade-off Potency per gram is low, so a meaningful declared dose takes a large powder inclusion and brings the mushroom taste with it, which limits it to formats that can carry flavour. The vitamin present is D2 rather than D3, and UV conversion varies with the batch and the irradiation run, so every lot has to be assayed to print a number.Active and formulation aid