Compare every Vitamin D2 product across UK retailers on Suppio, ranked by true value - price per active dose, not pack size. Prices refreshed daily.
Ergocalciferol - plant-based form of vitamin D, less potent than D3
We rank Vitamin D2 by price per 5mcg - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
Vitamin D2, also known as ergocalciferol, is a plant-based version of vitamin D. It is generally considered to be less potent than Vitamin D3, meaning it may not be as effective at raising levels in the body.
It is primarily used as a supplement to support bone health and immune function. Because it is derived from plants, it is often used by people who follow a vegan diet and cannot take supplements made from animal sources.
This supplement is produced by exposing certain types of fungi, such as mushrooms or yeast, to ultraviolet (UV) light. This process triggers a chemical change in the organism that creates the vitamin, which is then extracted and processed into a powder for capsules or drops.
This ingredient sits in a mid-range price bracket. This is because the process of using UV light to irradiate fungi is more involved than sourcing some basic minerals, but it remains more affordable than highly specialised or rare botanical extracts.
| Purpose | Typical studied dose | Evidence |
|---|---|---|
| increasing serum 25(OH)D levels in preschool children | 400 to 800 IU per day | limited |
| raising serum 25(OH)D concentrations | 50,000 to 300,000 IU as a bolus dose | emerging |
| raising serum vitamin D levels in adults | 600,000 IU as a parenteral injection | limited |
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
Prices across our retailer network are refreshed at least daily.
Ergocalciferol - plant-based form of vitamin D, less potent than D3
We rank Vitamin D2 by price per 5mcg - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
Prices across our retailer network are refreshed at least daily.