iv.

Vitamin D3

Vegan-friendly D3

The sunshine vitamin — without the sunshine. For everyone who lives indoors, in a northern latitude, or wears SPF every day (as you should).

Dose per gummy

125 mcg (5000 IU)

625% DV

Plant-sourced lichen-derived cholecalciferol

Why it's in Glowbite

What it does
for you.

i.Supports skin barrier and immune function*
ii.Critical for anyone with limited sun exposure or high SPF use*
iii.Plant-sourced (from lichen) — not lanolin-derived*
iv.Fat-soluble — take with the meal of the day containing fat

* These statements have not been evaluated by the FDA.

Mechanism

How it actually
works.

D3 is converted in the liver to 25-hydroxyvitamin D (the form measured in blood work) and then to the active 1,25-dihydroxyvitamin D in the kidney. Skin keratinocytes express the vitamin D receptor and use it to regulate barrier function, antimicrobial peptide production, and cell-cycle control.*

Why this dose

The dose
rationale.

5000 IU sits within the range considered safe for daily adult intake (the Endocrine Society tolerable upper limit is 10,000 IU/day for most adults). If you already take a D3 standalone or a multivitamin, sum your total daily intake and ask your doctor whether Glowbite's dose is appropriate for you.

Representative studies

The
receipts.

Vitamin D and the skin: physiology and pathophysiology

Bikle D.D. · Reviews in Endocrine & Metabolic Disorders · 2012

Comprehensive review of how vitamin D is produced, activated, and used in human skin — foundational paper for anyone studying cutaneous vitamin D biology.

Evaluation, Treatment, and Prevention of Vitamin D Deficiency: an Endocrine Society Clinical Practice Guideline

Holick M.F. et al. · Journal of Clinical Endocrinology & Metabolism · 2011

Consensus guideline that informs dosing recommendations and upper-intake limits for adult supplementation.

Interactions & cautions

Who should check with
a doctor first.

May interact with thiazide diuretics, digoxin, and some cholesterol-lowering drugs. Patients with sarcoidosis, hyperparathyroidism, or kidney disease should discuss with their prescriber before supplementing.

See the full safety page for contraindications across all seven actives.

Pairs with