Vitamin D3 5,000 by Seeking Health is a pure and potent vitamin D3 supplement in a vegetarian capsule that provides 125 mcg (5,000 IU) of cholecalciferol. Many people do not get sufficient vitamin D3 in their diet, and the synthetic vitamin D2 that is often added to dairy products is considered an inferior form of this vital nutrient. Vitamin D3 occurs naturally in fatty fish, cod liver oil, egg yolks, and beef liver. Vitamin D3 5,000 contains cholecalciferol derived from cholesterol in sheep’s wool, making it suitable for vegetarians.*
Dr. Ben Lynch
Vitamin D is essential for the functioning of many important systems in the body, and recent research has suggested that we may need more vitamin D than previously thought for optimal immune function and long-term health. In some climates, people may be able to produce adequate vitamin D3 from sunlight, but in cooler climates with longer winters, vitamin D deficiency may be more common.*
Vitamin D is required for optimal absorption of minerals including calcium, making it an important nutrient for supporting healthy bones and structural health. It may also play a role in supporting immune health and cellular integrity.*
If you are looking for a lower dose of vitamin D3, consider our Optimal Vitamin D Drops.

Getting enough, but not too much, vitamin D is needed to keep your body functioning well. Vitamin D helps with strong bones and may help prevent some cancers. Symptoms of vitamin D deficiency can include muscle weakness, pain, fatigue and depression. To get enough D, look to certain foods, supplements, and carefully planned sunlight.
https://my.clevelandclinic.org/health/articles/15050-vitamin-d–vitamin-d-deficiency
We think bacteria and viruses are tiny little things we can easily eliminate. Sometimes yes. Other times – far from. They are smart. They have evolved with us and also way faster than us.
https://www.drbenlynch.com/vitamin-d-infections/
Why?
Turns out that these little punks (infections) hijack our ability to USE vitamin D for our immune system.
Because they know that vitamin D kills them.
Next time you go to the doctor, check your 25 OH vitamin D3, don’t think you’re ‘Great! Your levels are above 50’ – no.
That’s not how it works.
It is now clear that vitamin D has important roles in addition to its classic effects on calcium and bone homeostasis.
As the vitamin D receptor is expressed on immune cells (B cells, T cells and antigen presenting cells) and these immunologic cells are all are capable of synthesizing the active vitamin D metabolite, vitamin D has the capability of acting in an autocrine manner in a local immunologic milieu.
Vitamin D can modulate the innate and adaptive immune responses.
Deficiency in vitamin D is associated with increased autoimmunity as well as an increased susceptibility to infection.
As immune cells in autoimmune diseases are responsive to the ameliorative effects of vitamin D, the beneficial effects of supplementing vitamin D deficient individuals with autoimmune disease may extend beyond the effects on bone and calcium homeostasis.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406/
- Vitamin D has important functions beyond those of calcium and bone homeostasis which include modulation of the innate and adaptive immune responses.
- Vitamin D deficiency is prevalent in autoimmune disease.
- Cells of the immune system are capable of synthesizing and responding to vitamin D.
- Immune cells in autoimmune diseases are responsive to the ameliorative effects of vitamin D suggesting that the beneficial effects of supplementing vitamin D deficient individuals with autoimmune disease may extend beyond effects on bone and calcium homeostasis.
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406/
Seeking Health Vitamin D
Key Benefits and Actions*
- May help support healthy growth and development
- May help support bone health as part of a healthy diet rich in calcium and other minerals
- May help support a healthy immune system
- May help support mineral absorption
Natural Stacks has a Vitamin D3 supplement – as it plays an integral role in regulating the neuromuscular and immune systems, as well as mood and sleep.
It’s also a critical hormone precursor that supports new cell growth and bone formation.
Natural Stacks Vitamin D3 features:
- 5,000 IU of Vitamin D3
- 100 mg of Organic Coconut Oil
- Highly bioavailable
Dr. Axe shares…
“According to several scientific studies and reviews, vitamin D deficiency symptoms can be linked to the following health problems“-
osteoporosis
heart disease
high blood pressure
cancer
autoimmune diseases
depression
insomnia
arthritis
diabetes
asthma
multiple sclerosis
chronic pain
psoriasis
fibromyalgia
autism
Researchers suggest that anyone with these health conditions or the following symptoms should be tested for vitamin D deficiency:weakness
https://draxe.com/nutrition/vitamin-d-deficiency-symptoms/
chronic fatigue
depression
trouble sleeping
anxiety
weak or broken bones
weakened immune system
inflammation and swelling