Richard Warren Meirowitz | Innovix Labs Full Spectrum Vitamin K2 vs Eight Leading Vitamin K-2 Supple

Here is a side-by-side comparison of nine leading Vitamin K-2 supplements: Innovix Labs Full SpectrumVitamin K2, Nutrigold Vitamin K2 (MK-7) Gold, Doctor's Best Natural Vitamin K2, Life Extension Super K with Advanced K2 Complex, Now Foods Vitamin K-2 (MK-4), Now Foods MK-7 Vitamin K-2, Jarrow Formulas MK-7, Solgar Natural Vitamin K2 (MK-7), Thorne Research Vitamin K2 Liquid (MK-4), and Carlson Labs Vitamin K-2 (MK-7). Vitamin K is one of the fat-soluble vitamins, along with A, D and E. There are two types of Vitamin K, namely K1 and K2. And within K2, there are several forms: * Vitamin K1 (Phyloquinones) * Vitamin K2 (Menaquinones) * MK-4 * MK-7 * MK-8 (not available in supplement form) * MK-9 (not available in supplement form) * MK-10 (not available in supplement form) Vitamin K1 is found in plants and is essential for blood clotting and coagulation. Supplementing is usually not necessary since the body recycles K1. It also blocks the effect of heart medications like Coumadin or Warfarin. Vitamin K2 can also have some effect on these drugs, so talk to your doctor about this. Food sources of K2 Vitamin K2 is neither recycled nor stored by the body. Unless you eat Vitamin K2 rich foods regularly, you will become deficient in a matter of days. Making matters worse, it is almost impossible to get Vitamin K2-rich foods at the grocery store. The richest food sources are fatty goose liver, natto, and fermented cod liver oil. Much lower levels are found in sauerkraut, old world hard cheeses, caviar, organ meats, and grass-fed butter. Eggs from pastured chicken also have a little K2. Regular butter and cheese have very low levels of K2. Why is K2 important? It keeps calcium in your bones and teeth and out of your arteries. It also keeps calcium out of soft tissues like kidneys and cartilage, preventing kidney stones and heel spurs. Without enough K2, calcium may get deposited in your arteries, adding to arterial blockage. Calcium also attaches to plaque. This can cause hardening of the arteries, heart attacks and strokes. K1 provides little or no cardiovascular benefits. Studies have repeatedly found associations between K2 and heart health, but no such connection exists for K1. The different MK forms activate different proteins that affect different functions in the body. About 15 such proteins have been identified, most of them very recently. How much should I take? 100 - 200 mcg (micrograms) per day should meet your needs. There is very little risk of overdosing because the body does not store K2. See note above about K1 and blood coagulation. Different MK forms Generally, animal foods contain MK-4 and fermented foods contain the longer ones MK-5 thru 14. We simply don't know much about the roles all of these K2 forms play. MK-4 is the most studied and consumed K2 in our diets. It is the main K2 form found in the brain. MK-4 is transported and stored in the body very differently than the other forms. It is the form of K2 found in breast milk. It is a fast-acting Vitamin K2. Babies need this form and are usually born deficient. In the US, newborns are given a shot of K1. In Japan, newborns get the more effective MK-4 instead. All healthy traditional cultures have consume mostly MK-4. MK-7 is often found in vegetables, especially fermented soybeans. The science on this longer-lasting K2 is still emerging but is extremely promising for heart health. MK-7 seems to be able to do some of the functions of MK-4 and it stays in the body for 2-3 days before being cleared. This higher half-life is desirable given its potent heart health benefits. MK-8 - 14 are found in fermented products like cheese. These may have heart health benefits too but the science is in its infancy. MK-8 thru 14 are not available in supplement form. CIS or TRANS MK-7? Some manufacturers are starting to make absorption and bioavailability claims about these two forms. As of now, none of the products reviewed here discuss this subject on their labels. This topic is worth staying tuned to. MK-7 can be made from several sources, but the most popular source is soybeans. If you are soy-sensitive, you need to be aware of this. There are also MK-7 forms made from chickpeas and flower petals. Since there are only two K2 forms available, you'd still benefit greatly from consuming K2 rich foods that contain other MK forms not available in supplement form. Finally, K2 works in conjunction with Vitamins A and D3. So make sure you are getting enough of those two vitamins as well. BREAKDOWN: Below is a breakdown of these supplements. Innovix Labs Full Spectrum Vitamin K2 (See, Full Spectrum VITAMIN K2 (by InnovixLabs). Provides two essential forms of K2 (MK-4 + MK-7). Total of 600 mcg of K2 per capsule. Soy-free. 90 Capsules.) ***** Not certified Kosher or Halal $21.99 for 90 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.24 (using Amazon's price) Price per 100 mcgs MK-7: $.27 Price per 100 mcgs MK-4: $.05 Price per 100 mcgs total K2: $.04 No soy No GMOs No stearates No ascorbyl palmitate No cholesterol Not vegetarian Not enteric coated Full spectrum K2 (MK-4 plus MK-7) One gel cap contains: 500 mcgs* of Vitamin K2 as MK-4 100 mcgs* of Vitamin K2 as MK-7 Some ingredients sourced from China (Vitamin K2 MK-4) Phone Number: (888) 799-7627 Manufactured in the U.S.A. Ingredients: Vitamin K2 MK-4 (as menatetrenone), Vitamin K2 MK-7 (as menaquinone-7), extra virgin olive oil, palm oil, gelatin, glycerin, purified water, and caramel color Nutrigold Vitamin K2 (MK-7) Gold (See, Nutrigold Vitamin K2 - MK7 Gold (From Natto in Organic Olive Oil), 100 mcg, 120 softgels) ***** Not certified Kosher or Halal $22.99 for 120 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.19 (using Amazon's price) Price per 100 mcgs MK-7: $.16 Price per 100 mcgs total K2: $.16 Contains soy (soy allergen free) No GMOs No stearates No ascorbyl palmitate No cholesterol Not vegetarian Not enteric coated Not full spectrum K2 (MK-4 plus MK-7) One gel cap contains 100 mcgs* of Vitamin K2 as MK-7 No ingredients sourced from China Phone Number: (800) 476-3542 Manufactured in the U.S.A. Ingredients: Vitamin K2 (as menaquinone-7), non-GMO organic olive oil (for absorption), non-GMO organic sunflower lecithin, vegetarian capsule (non-GMO plant cellulose) Doctor's Best Natural Vitamin K2 (MK-7) (See, Doctor's Best Natural Vitamin K2 MenaQ7 Vegetable Capsules, 60-Count) ***** Not certified Kosher or Halal $8.69 for 60 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.14 (using Amazon's price) Price per 100 mcgs MK-7: $.54 Price per 100 mcgs MK-4: N/A Price per 100 mcgs total K2: $.54 No soy No GMOs Contains stearates No ascorbyl palmitate No cholesterol Vegetarian Not enteric coated Not full spectrum K2 (MK-4 plus MK-7) One gel cap contains 45 mcgs* of Vitamin K2 as MK-7 Phone Number: (800) 333-6977 No ingredients sourced from China Manufactured in the U.S.A. Ingredients: Vitamin K2 (as menaquinone-7), modified cellulose (vegetarian capsule), magnesium stearate (vegetable source), maltodextrin, and fatty acids Life Extension Super K with Advanced K2 Complex (See, Life Extension Super K with Advanced K2 Complex Softgels, 90-Count) *** Not certified Kosher or Halal $13.25 for 90 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.15 (using Amazon's price) Price per 100 mcgs MK-7: $.08 Price per 100 mcgs MK-4: $.02 Price per 100 mcgs total K2: $.014 No soy (soy allergen free) No GMOs No stearates Contains ascorbyl palmitate No cholesterol Not vegetarian Not enteric coated Full spectrum K2 (MK-4 plus MK-7) One gel cap contains: 1000 mcgs* of Vitamin K1 1000 mcgs* of Vitamin K2 as MK-4 200 mcgs* of Vitamin K2 as MK-7 All active ingredients are sourced from China Phone Number: (800) 226-2370 Manufactured in the U.S.A. Ingredients: Vitamin K1 (as phytonadione), Vitamin K2 MK-4 (as menatetrenone), Vitamin K2 MK-7 (as menaquinone-7), ascorbyl palmitate, extra virgin olive oil, gelatin, glycerin, beeswax, purified water, and carob color Now Foods Vitamin K-2 (MK-4) (See, NOW Foods Vitamin K-2,100mcg, 100 Vcaps) *** Not certified Kosher or Halal $9.99 for 100 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.10 (using Amazon's price) Price per 100 mcgs MK-7: $ N/A Price per 100 mcgs MK-4: $.10 Price per 100 mcgs total K2: $.10 No soy No GMOs No stearates Contains ascorbyl palmitate No cholesterol Vegetarian Not enteric coated Not full spectrum K2 (MK-4 plus MK-7) One gel cap contains 100 mcgs* of Vitamin K2 as MK-4 Some ingredients sourced from China (Vitamin K2 MK-4) Phone Number: (888) 669-3663 Manufactured in the U.S.A. Ingredients: Vitamin K2 (as menaquinone-4), alfalfa (medicago sativa), cellulose (capsule), rice flour, maltodextrin, ascorbyl palmitate, and silica Now Foods MK-7 Vitamin K-2 (See, Now Foods Vitamin K-2 (MK7) Veg Capsules, 100 mcg, 60 Count) ***** Not certified Kosher or Halal $11.98 for 60 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.20 (using Amazon's price) Price per 100 mcgs MK-7: $.33 Price per 100 mcgs MK-4: N/A Price per 100 mcgs total K2: $.33 Contains soy No GMOs No stearates Contains ascorbyl palmitate No cholesterol Not vegetarian Not enteric coated Not full spectrum K2 (MK-4 plus MK-7) One gel cap contains 100 mcgs* of Vitamin K2 as MK-7 No ingredients sourced from China Phone Number: (888) 669-3663 Manufactured in the U.S.A. Ingredients: Vitamin K2 (as menaquinone-7), rice flour, cellulose (capsule), gelatin, ascorbyl palmitate, and silica Jarrow Formulas MK-7 (See, Jarrow Formulas MK-7 (vitamin K2), 60 Softgels) ***** Not certified Kosher or Halal $12.32 for 60 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.21 (using Amazon's price) Price per 100 mcgs MK-7: $.38 Price per 100 mcgs MK-4: N/A Price per 100 mcgs total K2: $.38 Contains soy No GMOs No stearates No ascorbyl palmitate No cholesterol Not vegetarian Not enteric coated Not full spectrum K2 (MK-4 plus MK-7) One gel cap contains 90 mcgs* of Vitamin K2 as MK-7 No ingredients sourced from China Phone Number: (310) 204-6936 Manufactured in the U.S.A. Ingredients: Vitamin K2 (as menaquinone-7), medium chain triglycerides, evening primrose oil, and soybean oil. Softgel consists of gelatin, glycerin, water, and caramel (as a light barrier) Solgar Natural Vitamin K2 (MK-7) (See, Solgar - Natural Vitamin K2 (MK-7) 100 mcg Vegetable Capsules - 50) *** Not certified Kosher or Halal $14.47 for 50 gel caps on Amazon Recommended Serving: one gel cap Price per gel cap: $.29 (using Amazon's price) Price per 100 mcgs MK-7: $.58 Price per 100 mcgs MK-4: N/A Price per 100 mcgs total K2: $.58 Contains soy No GMOs Contains stearates No ascorbyl palmitate No cholesterol Vegetarian Not enteric coated Not full spectrum K2 (MK-4 plus MK-7) One gel cap contains 100 mcgs* of Vitamin K2 as MK-7 Some ingredients sourced from China (dicalcium phosphate) Phone Number: (201) 944-2311 Manufactured in the U.S.A. Ingredients: Vitamin K2 (as menaquinone-7), dicalcium phosphate, vegetable cellulose, vegetable magnesium stearate, and silica Thorne Research Vitamin K2 Liquid (MK-4) (See, THORNE RESEARCH - Vitamin K2 Liquid - 1 fl oz [Health and Beauty]) **** Not certified Kosher or Halal $64.90 for one fl oz (30 mL) bottle on Amazon Flavor: none (no taste) 18 month shelf life after opening Don't have to refrigerate after opening 1200 drops per bottle Recommended Serving = 15 drops 1-3 times per day Price per serving (15 drops) = $.81 (using Amazon's price) Price per 100 mcgs MK-7: $ N/A Price per 100 mcgs MK-4: $.005 Price per 100 mcgs total K2: $.005 Not full spectrum K2 (MK-4 plus MK-7) One drop contains 1000 mcgs* of Vitamin K2 as MK-4 No soy No GMOs No stearates No ascorbyl palmitate No cholesterol Vegetarian Some ingredients sourced from China (proprietary information) Phone Number: (800) 228-1966 Manufactured in the U.S.A. Ingredients: Vitamin K-2 (menatetrenone-4), medium chain triglyceride oil, and mixed tocopherols Carlson Labs Vitamin K-2 (MK-4) (See, Carlson Labs Vitamin K-2, 5mg, 180 Capsules) ***** Not certified Kosher or Halal $28.65 for 180 capsules on Amazon Recommended Serving: one capsule Price per gel cap: $.16 (using Amazon's price) Price per 100 mcgs MK-7: $ N/A Price per 100 mcgs MK-4: $.002 Price per 100 mcgs total K2: $.002 No soy No GMOs Contains stearates No ascorbyl palmitate No cholesterol Not vegetarian Not enteric coated Not full spectrum K2 (MK-4 plus MK-7) One capsule contains 5 mgs of Vitamin K2 as MK-4 No ingredients sourced from China Phone Number: (888) 234-5656 Manufactured in the U.S.A. Ingredients: Vitamin K2 (as menatetrenone-4), microcrystalline cellulose, magnesium stearate (excipient), silicon dioxide, vegetable stearin, gelatin capsule PRICE: PER PILL: Thorne Research Vitamin K2 Liquid (MK-4) ($.84 per 15 drops) is the most expensive per pill of those in the comparison; followed by Solgar Natural Vitamin K2 (MK-7) ($.29 per gel cap); followed by Innovix Labs Full Spectrum Vitamin K2 ($.24 per gel cap); followed by Jarrow Formulas MK-7 ($.21 per gel cap); followed by Now Foods MK-7 Vitamin K-2 ($.20 per gel cap); followed by Nutrigold Vitamin K2 (MK-7) Gold ($.16 per gel cap) and Carlson Labs Vitamin K-2 (MK-4) ($.16 per gel cap); followed by Life Extension Super K with Advanced K2 Complex ($.15 per gel cap); followed by Doctor's Best Natural Vitamin K2 (MK-7) ($.14 per gel cap); and followed by Now Foods Vitamin K-2 (MK-4) ($.10 per gel cap), which is the least expensive per pill of those in the comparison. PRICE PER 100 MCGS K2 MK-7: Solgar Natural Vitamin K2 (MK-7) ($.58 per 100 mcg MK-7) is the most expensive per 100 mcgs K2 MK-7 of those in the comparison; followed by Doctor's Best Natural Vitamin K2 (MK-7) ($.54 per 100 mcg MK-7); followed by Jarrow Formulas MK-7 ($.38 per 100 mcg MK-7); followed by Now Foods MK-7 Vitamin K-2 ($.33 per 100 mcg MK-7); followed by Innovix Labs Full Spectrum Vitamin K2 ($.27 per 100 mcg MK-7); followed by Nutrigold Vitamin K2 (MK-7) Gold ($.16 per 100 mcg MK-7); and followed by Life Extension Super K with Advanced K2 Complex ($.08 per 100 mcg MK-7), which is the least expensive per 100 mcgs K2 MK-7 of those in the comparison. PRICE PER 100 MCGS K2 MK-4: Now Foods Vitamin K-2 (MK-4) ($.10 per 100 mcgs K2 MK-4) is the most expensive per 100 mcgs K2 MK-4 of those in the comparison; followed by Innovix Labs Full Spectrum Vitamin K2 ($.05); followed by Life Extension Super K with Advanced K2 Complex ($.02 per 100 mcgs MK-4); followed by Thorne Research Vitamin K2 Liquid (MK-4) ($.005); and followed by Carlson Labs Vitamin K-2 (MK-4) ($.002 per 100 mcgs MK-4), which is the least expensive per 100 mcgs K2 MK-4 of those in the comparison. PRICE PER 100 MCGS TOTAL K2: Solgar Natural Vitamin K2 (MK-7) ($.58 per 100 mcgs total K2) is the most expensive per 100 mcgs total K2; followed by Doctor's Best Natural Vitamin K2 (MK-7) ($.54 per 100 mcgs total K2); followed by Jarrow Formulas MK-7 ($.38 per 100 mcgs total K2); followed by Now Foods MK-7 Vitamin K-2 ($.33 per 100 mcgs total K2); followed by Nutrigold Vitamin K2 (MK-7) Gold ($.16 per 100 mcgs total K2); followed by Now Foods Vitamin K-2 (MK-4) ($.10 per 100 mcgs total K2); followed by Innovix Labs Full Spectrum Vitamin K2 ($.04 per 100 mcgs total K2); followed by Life Extension Super K with Advanced K2 Complex ($.014 per 100 mcgs MK-4); followed by Thorne Research Vitamin K2 Liquid (MK-4) ($.005 per 100 mcgs total K2); and followed by Carlson Labs Vitamin K-2 (MK-4) ($.002 per 100 mcgs total K2), which is the least expensive per 100 mcgs total K2 PILL SIZE: All of these products are small 100 mg pills with the exception of Thorne Research Vitamin K2 Liquid (MK-4), which is not in a pill form. SOY CONTENT: Innovix Labs Full Spectrum Vitamin K2, Doctor's Best Natural Vitamin K2 (MK-7), Life Extension Super K with Advanced K2 Complex, Now Foods Vitamin K-2 (MK-4), Thorne Research Vitamin K2 Liquid (MK-4), and Carlson Labs Vitamin K-2 (MK-4) do not contain soy. Nutrigold Vitamin K2 (MK-7) Gold, Now Foods MK-7 Vitamin K-2, Jarrow Formulas MK-7, and Solgar Natural Vitamin K2 (MK-7) contain soy. GMO CONTENT: None of these supplements contain GMOs. STEARATE CONTENT: Innovix Labs Full Spectrum Vitamin K2, Nutrigold Vitamin K2 (MK-7) Gold, Life Extension Super K with Advanced K2 Complex, Now Foods Vitamin K-2 (MK-4), Now Foods MK-7 Vitamin K-2, Jarrow Formulas MK-7, and Thorne Research Vitamin K2 Liquid (MK-4) do not contain stearates. Doctor's Best Natural Vitamin K2 (MK-7), Solgar Natural Vitamin K2 (MK-7), and Carlson Labs Vitamin K-2 (MK-4) contain stearates. ASCORBYL PALMITATE CONTENT: Innovix Labs Full Spectrum Vitamin K2, Nutrigold Vitamin K2 (MK-7) Gold, Doctor's Best Natural Vitamin K2 (MK-7), Jarrow Formulas MK-7, Solgar Natural Vitamin K2 (MK-7), Thorne Research Vitamin K2 Liquid, and Carlson Labs Vitamin K-2 (MK-4) do not contain ascorbyl palmitate. Life Extension Super K with Advanced K2 Complex, Now Foods Vitamin K-2 (MK-4), and Now Foods MK-7 Vitamin K-2 contain ascorbyl palmitate. CHOLESTEROL: None of these supplements contains cholesterol. VEGETARIAN: Thorne Research Vitamin K2 Liquid (MK-4) and Solgar Natural Vitamin K2 (MK-7) are the only products in this group that are vegetarian. CHINA: The following supplements contain ingredients that are sourced from China: Innovix Labs Full Spectrum Vitamin K2, Life Extension Super K with Advanced K2 Complex, Now Foods Vitamin K-2 (MK-4), Solgar Natural Vitamin K2 (MK-7), and Thorne Research Vitamin K2 Liquid (MK-4). PRECAUTIONS: If you take a blood thinner like Coumadin® (warfarin), which works by inhibiting the effect of Vitamin K, the use of a Vitamin K supplement, especially K1, should be discussed with your doctor before you begin taking it, as changes in blood thinning may occur. OPINION: All ten are good Vitamin K2 products, with some significant differences: Innovix Labs Full Spectrum Vitamin K2 contains MK-4 and MK-7. It is an excellent product. It does not contain soy. It does not contain GMOs. It does not contain stearates. It does not contain ascorbyl palmitate. It is not certified Kosher. It is not vegetarian. This is considered a full spectrum Vitamin K, i.e., it is a combination of two forms of Vitamin K, MK-4 and MK-7. Some of its ingredients are sourced from China (Vitamin K2 MK-4). Nutrigold Vitamin K2 (MK-7) Gold contains MK-7. It is an excellent product. It contains soy (soy allergen free). It does not contain GMOs. It does not contain stearates. It does not contain ascorbyl palmitate. It is not certified Kosher. It is not vegetarian. Doctor's Best Natural Vitamin K2 (MK-7) contains MK-7. It is an excellent product. It does not contain soy. It does not contain GMOs. It contains stearates. It does not contain ascorbyl palmitate. It is not certified Kosher. It is vegetarian. It contains less MK-7 per pill than the others (45 mcgs). Life Extension Super K with Advanced K2 Complex contains K1, MK-4, and MK-7. It is a fair product. It contains 1000 mcgs of Vitamin K1, 1000 mcgs Vitamin K2 as MK-4, and 200 mcgs of Vitamin K2 as MK-7. It does not contain soy. It does not contain GMOs. It does not contain stearates. It contains ascorbyl palmitate. It is not certified Kosher. It is not vegetarian. This is considered a full spectrum Vitamin K, i.e., it is a combination of several forms of Vitamin K. It contains 1000 mcgs of Vitamin K1 which the other nine supplements don't have. All of its active ingredients, including Vitamin K2, are sourced from China. Now Foods Vitamin K-2 (MK-4) contains MK-4. It is a fair product. It does not contain soy. It does not contain GMOs. It does not contain stearates. It contains ascorbyl palmitate. It is not certified Kosher. It is vegetarian. It includes alfalfa, which is a rich source of natural Vitamin K. MK-4 costs less than MK-7. It is the least expensive of the ten products mentioned. Some of its ingredients are sourced from China (Vitamin K2 MK-4). Now Foods MK-7 Vitamin K-2 (MK-7) contains MK-7. It is an excellent product. It contains soy. It does not contain GMOs. It does not contain stearates. It contains ascorbyl palmitate. It is not certified Kosher. It is not vegetarian. Jarrow Formulas MK-7 contains MK-7. It is an excellent product. It contains soy. It does not contain GMOs. It does not contain stearates. It does not contain ascorbyl palmitate. It is not certified Kosher. It is not vegetarian. It has the least amount of MK-7 of those in the comparison. Solgar Natural Vitamin K2 (MK-7) contains MK-7. It is a fair product. It contains soy. It does not contain GMOs. It contains stearates. It does not contain ascorbyl palmitate. It is not certified Kosher. It is vegetarian. Some of its ingredients are sourced from China (dicalcium phosphate). Thorne Research Vitamin K2 Liquid (MK-4) is a liquid and it contains MK-4. It is very potent, but it is expensive. One drop contains 1000 mcgs of MK-4. So, one serving consisting of 15 drops contains 15000 mcgs of MK-4. It does not contain soy. It does not contain GMOs. It does not contain stearates. It does not contain ascorbyl palmitate. It is not certified Kosher. It is vegetarian. It costs the most per bottle, but it is a great value per 100 mcgs MK-4. Some of its ingredients are sourced from China. The company refused to divulge what those ingredients are, claiming the information is "proprietary." In fact, that information is not proprietary, as a result of which I have deducted one star from this product. Carlson Labs Vitamin K-2 (MK-4) contains MK-4. It does not contain soy. It does not contain GMOs. It contains stearates. It does not contain ascorbyl palmitate. It is not certified Kosher. It is not vegetarian. RECOMMENDATION: If I were to select one, it would be Innovix Labs Full Spectrum Vitamin K2 because it is considered a full spectrum Vitamin K since it contains MK-4 and MK-7. It is the only supplement in this group that contains no soy, no GMOs, no stearates, no ascorbyl palmitate, and no cholesterol. One of its ingredients, MK-7, is sourced from China, but thoroughly tested in the United States. However, Thorne Research Vitamin K2 Liquid (MK-4), the only liquid in this group, is extremely potent, but it is also expensive. If for some reason you have a need for this kind of potency (one drop contains 1000 mcgs MK-4), Thorne Research Vitamin K2 Liquid might be a good choice. RATING: FIVE STARS: I rated Innovix Labs Full Spectrum Vitamin K-2, Nutrigold Vitamin K2 (MK-7) Gold, Doctor's Best Natural Vitamin K2 (MK-7), Now Foods MK-7 Vitamin K-2, Jarrow Formulas MK-7, and Carlson Labs Vitamin K-2 (MK-4) five stars. In my opinion, these are all excellent products for the reasons stated above. FOUR STARS: I rated Thorne Research Vitamin K2 Liquid (MK-4) four stars. In my opinion, this is an excellent product but the company failed to divulge ingredients sourced from China, improperly claiming that information is "proprietary." THREE STARS: I rated Life Extension Super K with Advanced K2 Complex, Now Foods Vitamin K-2 (MK-4), and Solgar Natural Vitamin K2 (MK-7) three stars. In my opinion, these are fair products for the reasons stated above. I have separately reviewed all of these supplements. * 1000 micrograms (mcg) equal one milligram (mg).