The spray is designed to be applied directly under the tongue or onto the inside of the cheek, where the mucosa is thin and richly supplied with blood vessels, allowing part of the active substance to be absorbed directly into the bloodstream without passing through the digestive tract. This is indeed a different route than with swallowed capsules or drops, but the ultimate goal – raising blood levels of vitamin D3 – is the same. The most reliable way to assess how well this route works for you personally is a 25(OH)D lab test after several months of regular use.

According to the NIH ODS (2024) and EFSA (2023), 4000 IU (100 µg) is the upper safe limit of daily intake for adults, meaning it is the highest dose considered safe for independent daily supplementation – though not everyone necessarily needs this much. Long-term intake at the level of 3200-4000 IU/day has, in one meta-analysis of RCTs, been associated with a slightly increased relative risk of hypercalcemia, although the absolute risk is small (Zittermann et al., 2023). If you plan to use the product long-term, we recommend having your vitamin D status checked by a doctor and adjusting the dose if necessary.

Yes, the manufacturer explicitly labels this product as suitable for vegetarians. This makes sense, as the spray does not contain gelatin or other directly meat-derived ingredients that would commonly make a product unsuitable for a vegetarian diet. However, if you are a strict vegan, we recommend checking the source of the cholecalciferol used directly with the manufacturer, as the origin of the active ingredient is not explicitly stated in the available information.

The peppermint flavoring is listed in the formula as a natural flavoring, added mainly to improve the taste when used under the tongue. Besides the flavoring, the formula also contains xylitol (for sweetness), emulsifiers (gum arabic and sunflower lecithin, which help disperse the fat-soluble vitamin D in a water base), an acidity regulator, and the preservative potassium sorbate. This means it is a somewhat more complex formula than simple oil-based drops, but all the listed ingredients are standard, permitted components of dietary supplements and are fully disclosed on the label.