THORNE - Vitamin D3 with a Metered Dispenser - Liquid Vitamin D Vegan Supplement…
- Vitamin D
- Liquid
- Vitamin D3
- 1 fl oz
A straightforward high-potency liquid D3 from a well-established supplement brand, worth considering if a dropper format suits your routine better than capsules.
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How it ranks among the 137 vitamin d we track
4.4★ across 65 Amazon ratings, Bayesian-smoothed toward the category average.
65 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
1,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 137 vitamin d we track - how the scorecard works · full vitamin d data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
Thorne's D178 is a liquid vitamin D3 supplement delivered through a metered dropper, providing 4,000 IU per dose from a 1 fl oz bottle formulated for 30 servings. It is unflavored and made without animal-derived ingredients, positioning it as a vegan option for people who prefer drops over capsules.
Liquid vitamin D appeals to anyone who has trouble swallowing pills or wants to fine tune dosage below or above a fixed capsule amount, since a metered dropper lets the dose scale with the drop count. Thorne is a brand commonly stocked by practitioners, and this formula's vegan D3 sourcing sets it apart from the more common lanolin-derived versions on the market.
- 4,000 IU vitamin D3 per dose
- Vegan formula
- Metered dropper dispenser
- 30 servings per 1 fl oz bottle
Who it's for
Suited to adults who want a flexible, swallow-free way to take a high-dose D3 supplement, including those already following a vegan or plant-based diet. Not the right fit for someone who wants a fixed, no-measuring daily capsule.
Strengths and trade-offs
Drawn from this product's published specifications.
- Metered dropper allows precise dose adjustment
- Vegan D3 source, no lanolin
- High 4,000 IU strength per serving
- Unflavored, easy to mix in
- 30 servings from a 1 fl oz bottle is a short supply for daily high-dose use
- No description or seller detail beyond the label
Performance notes
Each full dropper delivers 4,000 IU, several times the standard daily recommendation, so the bottle is built for people who want a therapeutic-range dose rather than a maintenance amount. Because it is unflavored, it can be added to food or a drink or taken directly.
Specifications
| Brand | THORNE |
|---|---|
| Model | D178 |
| Form | Liquid |
| Supplement Type | Vitamin D3 |
| Count | 1 fl oz |
| Flavor | Unflavored |
| Benefits | Supports Immune Function and Cardiovascular Health* |
| Diet | Vegan |
Other THORNE vitamin d
How it compares
This product against the closest alternatives we track in vitamin d.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| THORNE - Vitamin D3 with a Metered Dispenser - Liquid Vitamin D Vegan Supplement…This product | 4.4 / 5 | 65 | 4.0 / 5 |
| Nature's Bounty Vitamin D3 5000 IU SoftgelsNature's | 4.8 / 5 | 83,500 | 4.7 / 5 |
| Sports Research Vitamin D3 5000 IU with Coconut MCT OilSports | 4.8 / 5 | 71,400 | 4.7 / 5 |
| Nature Made Vitamin D3 5000 IUNATURE | 4.8 / 5 | 67,100 | 4.7 / 5 |
| vitafusion Vitamin D3 GummiesVitafusion | 4.8 / 5 | 54,500 | 4.7 / 5 |
Similar vitamin d from other brands
Questions about the THORNE D178
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Is Thorne's D178 vitamin D3 vegan?
Yes, the listing specifies a vegan formulation, distinguishing it from D3 sourced from lanolin.
How much vitamin D does each dose provide?
A full metered dose delivers 4,000 IU.
How long does one bottle last?
The 1 fl oz bottle is formulated for 30 servings at the labeled dose.