Vitamin D

The sunshine vitamin — and, in the UK, the one worth planning for over winter

All articles checked for accuracy against the GB NHC Register and all sources have citations with verified links to their relevant studies.

Sunlight makes most of our vitamin D, but in the UK that process falls short for many people across autumn and winter. Supplements and careful sourcing matter — especially for those avoiding animal-derived ingredients.

This article explains what vitamin D is, why it matters at UK latitudes, how the nutrient is regulated for labelling, and how WellsparQ approaches sourcing and dosing. It highlights the difference between D2 and D3, the national guidance on daily intake, and which WellsparQ products contain declared vitamin D.

Ingredient Snapshot

What it is

A fat‑soluble vitamin that acts like a hormone involved in mineral metabolism.

Where from

Form D2 from plants/fungi; D3 from skin or animal/algal sources.

Known for

Key nutrient for calcium and phosphorus absorption and normal bone, teeth, muscle and immune function.

In WellsparQ

• LipoD3K2 Drops100 µg / 4,000 IU (2000% NRV)
• NattakoComplex5.5 µg / 220 IU (110% NRV)
• VitaBright Gummies5 µg / 200 IU (100% NRV)
• BiomCalm2.5 µg / 100 IU (50% NRV)
• ImmunoDefence Pro / VitaralDaily3652.5 µg / 100 IU (50% NRV)
• Workout Recovery Matrix1.4 µg

For reference

• EU labelling NRV5 µg (200 IU)/day
• NHS recommendation10 µg (400 IU)/day, esp. autumn–winter
• EFSA Tolerable Upper Intake Level (adults)100 µg (4,000 IU)/day

Vitamin D is unusual among the vitamins because we are built to make most of it ourselves — in the skin, from sunlight. That works well in summer and much less well through a British autumn and winter, which is why UK health advice singles vitamin D out for special mention. It is also an authorised vitamin, so it is one where WellsparQ can state a contribution plainly. And because the usual supplemental form is animal-derived, sourcing matters to a plant-powered brand — a point we take care over.

What vitamin D is

Vitamin D is a fat-soluble vitamin that behaves more like a hormone. It comes in two main forms: D2 (ergocalciferol) from some plants and fungi, and D3 (cholecalciferol), which the skin makes from sunlight and which is generally the more effective form at raising and maintaining blood levels ^¹². Whichever the source, the body converts it in the liver and kidneys to the active hormone, calcitriol ^¹.

Vitamin D's best-established roles in nutrition science are in the absorption of calcium and phosphorus and the normal maintenance of bones, teeth and muscle, and in the normal function of the immune system ^¹². These are descriptions of the nutrient's biology, not benefits attached to any product.

Why the UK plans for it

At UK latitudes the sun is too weak from about October to March for the skin to make vitamin D, so blood levels tend to fall over winter ^³. Public Health England / the NHS therefore advise that adults and children over one consider a daily 10 µg (400 IU) supplement, particularly in autumn and winter, and that some groups — people with little sun exposure, or with darker skin — consider it year-round ^³. This is national public-health guidance, reported here as fact.

Sources, and the vegan question

Sunlight aside, few foods contain much vitamin D. Natural dietary sources are mainly oily fish, egg yolk and liver; plant and vegan sources are limited to some UV-exposed mushrooms and fortified foods ^¹³. Supplements matter partly for this reason.

Most supplemental D3 is derived from lanolin (sheep's wool) and so is not vegan. WellsparQ addresses this directly: the LipoD3K2 Drops use a vegan D3 sourced from algae rather than lanolin — a genuine cholecalciferol that suits plant-based diets. Where D2 or algal D3 is used, the formula can be vegan; this is confirmed per product in our database.

Where vitamin D appears in the WellsparQ range

Source: WellsparQ Supplements Database.

A note on the higher-dose drops

The LipoD3K2 Drops deliver 100 µg (4,000 IU) per dose — right at EFSA's Tolerable Upper Intake Level for adults, and a level intended for people who want a higher maintenance intake rather than a casual top-up ^⁵. It is a product to take to the stated dose and not to combine unthinkingly with other vitamin D sources. Vitamin D is fat-soluble and stored, so total intake across all supplements is what counts. Anyone pregnant, breastfeeding, taking other supplements or managing a health condition should check their total vitamin D with a GP or pharmacist; very high intakes over time can raise blood calcium and are not advisable ^¹⁵.

Authorised claim — what vitamin D may say

Vitamin D is an authorised vitamin under retained EU Regulation 432/2012. The wording in WellsparQ's approved set (claims.json) is:

To carry it, a product needs a significant amount of vitamin D — at least 15% of the 5 µg NRV per portion (0.75 µg) — which every listed product meets ^⁴⁶.

Where it fits your day

Vitamin D is the one nutrient UK guidance actively asks people to think about, especially once the clocks go back. It is a quiet, daily consideration rather than something felt — and, being authorised, one we can describe plainly and leave there. In the WellsparQ range it appears in sensible forms, including a genuinely vegan algal D3, honestly declared in both micrograms and international units.

Rooted in nature. Backed by research.