Hi-D – Pure Shiitake Vitamin D. Nothing else.

1 in 4 people worldwide are vitamin D deficient.

Most people reach for a synthetic supplement. Hi-D is different. Our Shiitake mushrooms are UV-activated using bespoke light technology — producing vitamin D2 the same way your skin produces it in sunlight. Bioavailable. Clean. Whole-food.

Pure Shiitake Vitamin D. Nothing else.

Most vitamin D supplements are synthetic — derived from lanolin (sheep’s wool) or chemical processes. Hi-D uses a completely different approach, grounded in whole-food nutrition science.

UV-activated Shiitake — vitamin D produced the same way human skin makes it
Whole-fruiting body only — no mycelium, no grain filler, no starchy binders
100% plant-based and vegan — no lanolin, no animal products
Grown on certified organic small-scale farms
Zero-waste policy with fully recyclable packaging

Hi-D was developed alongside CSIRO — the Commonwealth Scientific and Industrial Research Organisation. Our UV-activation process and product formulations are grounded in peer-reviewed science, not marketing claims.

Everything you want to know about Hi-D