- Immunity Support: Superior Source Vitamin D-3 contains vitamin D3 to support a healthy immune system, brain, and nervous system; it also helps with calcium absorption
- Bone Health Support: This health supplement is also designed to support the body's natural ability to maintain strong bones and teeth
- Pure Ingredients: Our D-3 tablets are non-GMO and contain no excessive fillers, additives, or excipients, focusing on quality and purity for your dietary needs
- Quick Absorption: The sublingual technology enables rapid dissolution for enhanced absorption, providing immunity support with ease
- About Us: Superior Source has been formulating sublingual vitamins since 1998 in our family-owned manufacturing facility

Arob –
Little but does the job
I love that it’s small and dissolves under the tongue easily. It seems to work well for me. I didn’t give any stars for swallowing because you don’t swallow it and it doesn’t really have a taste to me.
FJP82075 –
Exactly what I needed
Years of unhealthy behaviors finally caught up to me in my mid 40’s (over eating, sugar addiction, sedentary lifestyle, smoking, not enough sleep, not drinking enough fluids, etc). I was sick & tired of feeling sick & tired, basically. I decided enough is enough & finally started living a much healthier lifestyle (April 2023). On top of a much healthier diet, regular exercise, & proper sleep, I added supplements to the mix & my favorite addition has been the Superior Source MicroLingual Vitamin D³. Firstly, I love that it bypasses the digestive system & goes directly into the bloodstream. I truly appreciate that they’re tiny, they melt very quickly, there’s no unpleasant aftertaste whatsoever (I honestly don’t taste anything at all), & they’re very inexpensive. Something else to note is that these tiny sublingual tablets seem as if they’d crumble under the slightest pressure but they remain whole & unbroken in the bottle. I am so impressed by this sublingual D³ supplement that I’m looking to order more from the brand. Highly recommended.
Paul Elman –
Great product and price point…
I’ve use this product regularly for 3 + years.It seems to work very well as my Vitamin D levels are very normal.It is a good price point and easy to digest as it dissolves when swallowed.
Emilie B. –
Dissolves quickly with a pleasant taste, great alternative to swallowing large pills!
I loved finding this option for my D3! I have to swallow a lot of pills and I feel like I’m choking sometimes. These are very tiny and dissolve very quickly, making the process so quick and easy.
Charlie –
quality product
quality easy to take product
Susannah –
good product
Just what I wanted. Easy to take. Tastes okay.
Tamara Suttle –
Love that I can find these online!
So happy to find these online. I first started using them several years ago when they were recommended to me at Sprouts Market. (I trust their people who work with food supplements.) Finding them online is just an extra convenience and bonus for me. Love this brand that simply dissolves under the tongue and leaves no bad taste.
Mama T –
Something that works
These helped me get my D up in my labs compared to the ones that are not sublingual. The taste is fine, no terrible aftertaste. I buy on repeat. Good quality.