Thorne Vitamin D K2

Vitamin D/K2 Liquid

Thorne Vitamin D/K Liquid is a great way to supplement with both Vitamin D3 and K2. Though most people are extremely low in vitamin D, supplementing with K2 in addition to Vitamin D may be more beneficial for bone and cardiovascular health.*

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The Importance of Vitamin D

Vitamin D, or cholecalciferol is more of a pro-hormone than it is a “vitamin.” Though the optimal level of vitamin D is 40-80 ng/dL, the average person has a blood level of only 16-25 ng/dL.

The following are just some of the health issues connected to low vitamin D:

  • Increased risk of the flu
  • Insulin resistance and diabetes
  • Heart disease
  • Osteoporosis and bone fractures
  • Atopic dermatitis
  • Cancer
  • Decreased production of adrenal hormones, including DHEA, androstenedione, and cortisol
  • Decreased strength
  • Increased body fat
  • Low birth weight of newborns
  • Multiple sclerosis
  • Psoriasis
  • Rheumatoid arthritis Schizophrenia
  • Type I diabetes

Why Vitamin D3 and K2 together?

Thorne’s formula includes both vitamin D3 and K2. D3 is the more bioavailable form of vitamin D, whereas vitamin D2, common in vegan formulas, is poorly absorbed.*

Though it’s a good idea to supplement with vitamin D3, it may be even more beneficial to include vitmain K2, as it seems to enhance the effects on bone and cardiovascular tissue.*

Quality and Purity

Thorne Vitamin D/K2 Liquid is diluted in-house with medium-chain triglycerides. This is one of Thorne’s best practices that helps them stand apart from other supplement manufacturers.

All Thorne products are free of acesulfame-K (Ace-K), aspartame, banned substances, benzoic acid, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), bisphenol A (BPA), carmine (cochineal, natural red 4), cyclamates, eggs, ephedra sinica (Ma Huang), ethyl vanillin, ethylene oxide (ETO), FD&C numbered color pigments, glycols (propylene glycol), high-fructose corn syrup (HFCS), hydrogenated oils (partially hydrogenated oil, trans-fats), irridation, nut-derived ingredients (tree nuts, peanuts), polyethylene glycol (PEGs), propyl gallate, saccharin (Sweet ’N Low, Sugar Twin), sodium benzoate, sorbitol, stearates (stearic acid, magnesium stearate), sucralose (Splenda), Sulfites (potassium bisulfite, sodium sulfite), synthetic vanillin, tertiary butylhydroquinone (TBHQ), titanium dioxide.


Supplement Facts and Suggested Use

Servings Size: Two Drops
Servings Per Container: 600

Amount Per Serving% DV
Vitamin D (as Vitamin D3)25 mcg (1000 IU)125%
Vitamin K (as Vitamin K2 (Menatetrenone))200 mcg167%
Daily Value (DV)


Other Ingredients: Medium Chain Triglyceride Oil, Mixed Tocopherols, MK4

Take 2 drops one to three times daily or as recommended by your health professional. Invert bottle to dispense individual drops. May be added to food or mixed in beverages. 


Frequently Asked Questions

The following are the most common questions I get from members of my online fitness training program, Facebook group members, or blog readers. These are my answers and do not necessarily reflect the opinions of Thorne.

How do I know how much vitamin D I should use?

Ideally, you should get your vitamin D levels tested a couple of times per year. Without knowing how well you absorb and retain it, you’re left with the conservative recommendation of 1000-3000 IU per day. However, the Vitamin D Council recommends:

  • Children: 1000 IU per 25 pounds of body weight
  • Adults: 5000 IU including pregnant and breastfeeding women
  • Upper limit (for us Northerners): 10,000 IU per day

Do I have to take the vitamin D every day?

Because vitamin D is a fat soluble vitamin, your body is better at storing it than it is the water soluble vitamins like vitamin C and the B vitamins. With that in mind, some people take higher doses less often. The research doesn’t yet say one way is better than the other.