Last updated on October 30, 2025 at 1:18 pm
It’s that time of year when I start taking vitamin D again. I’ve always reached for my BetterYou oral spray, not only because it’s convenient, but because I think it’s better absorbed through the mouth than the stomach.
Seems reasonable, doesn’t it? Sprays can begin to be absorbed orally and may reach the bloodstream faster than pills, which must first pass through the stomach and liver. But this is the first time I really stopped to ask myself beyond the marketing: is a vitamin D spray really better than tablets or capsules?
So I decided to find out. I went through all the studies I could find comparing vitamin D sprays, tablets, and capsules to see what the evidence actually says. Some of the results were not what I expected.
Vitamin D Spray vs. Tablets: The Quick Answer
If you are healthy, a spray, tablet or capsule is just as good as others in the same dose. But if you have stomach or intestinal problems that make it difficult to absorb nutrients, a vitamin D spray may work better for you.
What exactly is a vitamin D oral spray (and how does it work)?
An oral vitamin D spray is a liquid supplement that you spray directly into your mouth — usually inside the cheek or sometimes under the tongue. This area is full of tiny blood vessels, so vitamin D can be absorbed directly through the soft tissues and into your bloodstream. This process is called buccal or sublingual absorption.
Sounds appealing, doesn’t it? In theory, it should be a faster and more direct way to get vitamin D into your body. Sprays do not need to be broken down in the stomach and do not rely on digestive juices or bile to be absorbed.
However, not all of the spray stays in your mouth – some is naturally swallowed, which means some still travels through your digestive system. So it doesn’t completely bypass the gut, but it does provide an alternative way for your body to absorb vitamin D.
What the Studies Say About Vitamin D Spray vs. Tablets (and Capsules)
Once I started looking at the research, I was surprised how little there actually is on this topic — and how small most of the studies are. However, the results give us a pretty good idea of what to expect.
2016 UK study – spray works as well as capsules
This short winter study from the University of Ulster involved 22 healthy adults who received the same daily dose 3,000 IU of vitamin D3either as an oral spray or capsules, for four weeks. The goal was to see if the spray worked as well as ingesting vitamin D.
At the end of the study, vitamin D levels increased by about the same amount in both groups. The researchers concluded that a The oral spray is just as effective as the capsules to increase vitamin D levels in healthy adults.
Oral sprays are provided by Better youbut the study itself was funded by the Department for Employment and Learning, Northern Irelandand the Public Health Agency in Belfast. Some researchers had previously received grants from BetterYou for unrelated projects.
2019 study – no real difference
This study involved 75 healthy adults who took 3,000 IU of vitamin D3 every day for six weeks, either as oral spray or as capsules.
The researchers measured how much their vitamin D levels changed over time and found no real difference between the two groups. Both the spray and capsules increased vitamin D levels equally effectively.
Like the previous UK study, this research suggests that for healthy peoplean oral spray and a capsule they work equally well when you take the same dose.
2015 study – spray worked best in people with intestinal problems
This study included 20 healthy adults and 20 people with digestive diseases that make it harder to absorb nutrients, such as Crohn’s disease, ulcerative colitis, cystic fibrosis, intestinal resection (surgical removal of part of the intestine), and certain liver problems.
Everyone got the same daily amount 1,000 IU of vitamin D3 for 30 days, either as a oral spray (absorbed orally) or a soft gel capsule.
At the end of the study, both groups saw an increase in their vitamin D levels, but the spray worked better, especially for those with gut problems. Their vitamin D levels increased more than double compared to those who took capsules. This suggests that a spray may be a better option for people who struggle to absorb nutrients properly.
2020 review – sprays don’t beat it
This Scientific review 2020 gathered all available studies by comparing vitamin D spray with tablets or capsules. It looked at the research we’ve already discussed — including studies from 2016, 2019, and 2015 — along with some smaller ones.
After carefully examining the evidence, the reviewers came to this conclusion Vitamin D sprays are not superior in other forms of vitamin D when the same dose is used. They also highlighted several limitations in the existing research, such as small sample sizes and differences in study designwhich make direct comparison of results difficult.
The authors noted that the sprays could still be a good choice for people who have difficulty swallowing pillsor those who already take many medications and prefer to avoid adding more tablets. They said that too more research is neededespecially in people with malabsorption problems, to see if the sprays offer any real advantage in these cases.
What about Tablets? (Most tests used capsules, but here’s what we know)
Most studies were compared vitamin D spray with capsulesnot tablets, so there isn’t much research looking directly at sprays and tablets. However, what we do know gives us a pretty good idea.
Studies show that Vitamin D tablets and capsules work in a similar way when the same amount is taken. A study (tablet vs. capsule vs. oral solution) found that a vitamin D tablet and a capsule raised vitamin D levels almost identically, suggesting they are equally effective.
A newer 2023 study compared different types of vitamin D – including one orodispersible form (that melts in your mouth), a chewable tabletand a soft gel capsule – and found that all of them successfully increased their vitamin D levels.
So even though we don’t have direct research spray vs. tabletsthe evidence from the capsule studies is still valid. For most healthy adults, a Vitamin D spray and a tablet will work about the sameas long as you take the right dose.
When a vitamin D spray might work best
Most people will get the same benefit from a spray, capsule or tablet – but there are a few situations where a spray might make more sense:
- If you have bowel or liver problems
Conditions such as Crohn’s disease, ulcerative colitis, cystic fibrosis, previous intestinal resection (surgical removal of part of the intestine), or certain liver problems can make it difficult for your body to absorb nutrients. A spray allows some of the vitamin D to be absorbed directly from the mouth before it reaches the digestive system. - If you have difficulty swallowing the tablets
Oral sprays may be more convenient for children, older adults, or anyone who struggles with pills. They’re also handy if you’re already taking a lot of medication and want to avoid adding more tablets. - If you often forget to take your supplements
Sprays are quick and don’t require water or food, so some people find them easier to use regularly.
Is a vitamin D spray best for older adults?
If you are healthy and over 60, a vitamin D spray and a tablet or capsule generally work equally well in the same dose. Age alone does not appear to reduce how well vitamin D is absorbed from the gut. The biggest problems with age are that the skin produces less vitamin D, people often spend less time outdoors, and certain medications can affect how vitamin D is used in the body.
A spray can still be a good option if you have trouble swallowing pills or if you already take a lot of medicine and want to avoid more tablets. If you prefer pills, that’s fine too — just take your vitamin D with a meal for best results.
Does the form of vitamin D matter? (D3 vs Calcifediol)
Most vitamin D supplements, whether in spray or tablet form, contain vitamin D3 (cholecalciferol) – the same type your body makes when sunlight hits your skin. It is converted in the liver into a form called calcifediol (25-hydroxyvitamin D3)which is the main type of vitamin D found in your blood.
Some newer supplements skip this first step and use calcifediol directly. This form does not need to be processed by the liver, so it can increase vitamin D levels faster and more predictableespecially to people who are struggling to raise their levels with the D3 standard.
For most healthy people, regular vitamin D3 works just fine. But if your levels remain low despite regular D3 intake, or if you have liver or absorption problems, a calcifediol supplement it may be worth discussing with your doctor.
Final Thoughts – Which is best for you?
After looking at all the research, it’s clear that there is no “best” way to get vitamin D. What matters most is taking regularly and taking the dose correctly for your needs.
Sprays, tablets and capsules do the job if you are healthy. The spray just offers another option – one that’s convenient, easy to use, and sometimes better for people with absorption issues.
So choose the form that you will actually remember to take every day. Consequence is far greater than form.
