What the Buccal Absorption Research Actually Shows
This spray delivers 3000 IU vitamin D3 and 75μg vitamin K2 (MK7) via four sprays absorbed through the inner cheek, rather than through digestion. As covered in more detail in our complete D3+K2 guide, the evidence for buccal (oral spray) absorption versus standard capsules is genuinely mixed rather than uniformly favouring spray: some randomised trials have found meaningfully better absorption via spray, particularly in people with intestinal malabsorption conditions specifically, while other studies found no significant difference between the two delivery methods in healthy adults. The clearest, most consistent advantage in the research relates to people with digestive absorption issues — for general use in otherwise healthy people, spray and standard capsules appear more comparable than dramatically different.
D3 helps the body absorb calcium and supports normal immune function, while K2 is studied for directing that calcium toward bone rather than arteries — genuinely complementary mechanisms, and the Rotterdam Study’s well-known finding linking higher dietary K2 intake to cardiovascular outcomes reflects observational dietary data rather than a controlled supplementation trial, worth knowing when reading “heart health” framing.
Worth knowing: if you take warfarin or other blood-thinning medication, vitamin K can reduce its effectiveness, and dosing may need to be stabilised and monitored by a doctor if you take both.
3000 IU is within a reasonable general range, though still worth confirming with your GP if you haven’t had your vitamin D levels tested, particularly for ongoing daily use. Made in the UK with natural peppermint flavour, free from artificial preservatives or flavours. Contents: 12ml (120 sprays), providing a one-month supply at four sprays daily. Spray onto the inside of your cheek and hold briefly before swallowing. Speak to your GP before starting if you take blood-thinning medication, are pregnant or breastfeeding, or have an existing health condition.
The Research Behind This Product
Supplement Spotlights
Vitamin D3 and K2 Together: What UK Research Actually Shows
What research genuinely supports about combining vitamin D3 and K2 for bone and heart health — including the honest limitations researchers themselves acknowledge.
Get the Full Guide
