Women going through IVF who had adequate levels of Vitamin D were nearly twice as likely to produce high-quality embryos and more likely to become pregnant than women who were deficient in Vitamin D, as discovered by researchers studying the impact of Vitamin D levels had on fertility outcomes. The study, published in Endocrine Society's Journal of Clinical Endocrinology & Metabolism suggests that low levels of Vitamin D can contribute to infertility.
Concerningly, over 40% of the US population is deficient in Vitamin D. Levels of 30 ng/ml are recommended for general health, a significant portion of the country have levels much lower than sufficient.
In the simplest terms, Vitamin D helps eggs grow properly. Without adequate Vitamin D, eggs don’t grow as well.
It means that making sure your Vitamin D levels are sufficient are an important factor in your fertility. Thankfully, it’s easy to test and find out if your Vitamin D levels are optimized or if they need a boost.
If your Vitamin D levels are low, Vitamin D supplementation is inexpensive and easy to access.
If you opt to begin taking a daily Vitamin D supplement it’s really important to take Vitamin D paired with K2, like the Happy Stork Vitamin D supplement.
Vitamin D plays a critical role in your body's absorption of calcium, controlling how much you absorb and maintain. K2 helps your body direct calcium to where it needs to go, the bones and teeth. The K2 helps prevent excess calcium from depositing in the blood vessel walls.
Because so many are deficient in Vitamin D, it can take a higher amount to raise Vitamin D levels to an optimized level. For those trying to conceive, research has shown that 10,000 iu, a much higher amount than most Vitamin D daily supplements contain, are more likely to have the desired impact.
Taking a daily Vitamin D supplement and retesting your levels 90 days later is the best way to monitor your levels and ensure you’re in the optimized zone.
How you take your supplements matters just as much as what supplements you’re taking. Unlike many supplements. Vitamin D is fat soluble. That means if you don’t take it with fat, your body won’t be able to access the nutrients of your Vitamin D supplement.
You can take your daily supplement with a meal that contains fat, or with a product like our MCT oil. You need about a tablespoon of healthy oil (like our MCT oil) or 10 grams of dietary fat with your meal to allow your body to absorb a fat-soluble supplement like Vitamin D.
Some examples of what you can with your Vitamin D supplement include:
Possibly the easiest way to pair your fat soluble vitamins with a dietary fat is to take with a tablespoon of healthy oil. For this reason we recommend a bottle of our Medium-Chain Triglyceride oil, which has additional health helping benefits.
https://www.sciencedaily.com/releases/2014/08/140814191530.htm
https://pmc.ncbi.nlm.nih.gov/articles/PMC11253454/
https://pubmed.ncbi.nlm.nih.gov/30611263/
https://pmc.ncbi.nlm.nih.gov/articles/PMC10305830/
A September 2026 study found that women who supplemented with CoQ10 before IVF experienced significantly better reproductive outcomes than those who did not.
The 90 day maturation process of eggs is when they are most sensitive to hormones and nutrients. Understanding the process helps time when to start taking supplements to help improve egg quality ahead of trying to conceive.
