May 1, 2025: We have to make an extended trip out of town from May 6 - June 13. We will still be shipping but only 1-2 times per week until stock runs out, sorry for the hassle and delay!
Apr 19, 2025: 10 mg/drop is now available! Please only buy this if you don't mind hot water bathing your K2 bottle every so often!
Apr 11, 2025: We're back with the new bottles! Note that the new bottles are slightly bigger, but we kept the number of drops, IU's per drop, and the total amount of K2 MK-4 total the same. Sorry for the delay!
Feb 17, 2025: It's best practice to shake the bottle before dispensing drops to ensure an even distribution of vitamin content with each drop. Remember to squeeze the dropper bulb while shaking.
We are currently shipping 2 mg/drop bottles with the following info (updated Apr 16, 2025):
(see 10 mg/drop bottle info after)
Serial Number (s/n) | Date Range Sold | Lab Results & Info |
---|---|---|
B0337 - onward | Apr 11, 2025 - onward |
Vitamin K2 MK-4 Powder:
Extra Virgin Olive Oil, Organic:
Bottle & Cap:
|
See all previous batch's COAs. |
We are currently shipping 10 mg/drop bottles with the following info (updated Apr 19, 2025):
Serial Number (s/n) | Date Range Sold | Lab Results & Info |
---|---|---|
C0059 - onward | Apr 16, 2025 - onward |
Vitamin K2 MK-4 Powder:
Extra Virgin Olive Oil, Organic:
Bottle & Cap:
|
See all previous batch's COAs. |
Cost per mg of VK2 MK-4:
- ~2 mg/drop, 860 drops
- 1,756 mg at $0.0336/mg
- ~10 mg/drop, 860 drops
- 8.729 mg at $0.0286/mg
Notes:
- Please keep bottle in a dark & cool place and keep the lid tightly closed (don't over-hulk it though).
- 10 mg/drop bottles: the K2 powder can crystallize out of solution at lower temperatures ~60ºF (15.5ºC). This should not be a problem during the warmer months of the year (depending on where you live), but also be aware that if the A/C is blowing directly in the vicinity of the bottle, it can also crystallize. Placing the bottle in a warm/hot water bath for a bit should dissolve it back into solution. Remember, after bathing to squeeze the dropper bulb and shake the bottle before using. Please ONLY purchase this if you don't mind hot-water-bathing your K2 bottle when necessary!
Specifications (updated Apr 19, 2025, changes underlined):
- Ingredients: Extra Virgin Organic Olive Oil (EVOOO), Vitamin K2 MK-4 powder.
- you may see small particles of olives in solution, this is considered normal as part of the unfiltered milling process.
- Excipients: none.
- Vitamin K2 MK-4 Source Material: Derived from geraniol, however because of the chemical reactions and transformations involved, this is considered a synthetic product (as opposed to an extract).
- County of Origin:
- Vitamin K2 MK-4: See table above.
- EVOOO: See table above.
- Certificate of Analysis (COA) available online with every order (why the COA? | view COAs)
- Bottled in an amber glass jar for protection from UV light (why amber?)
All bottle components are made in the USASee tables above for bottle components' country of origin.- Bottle dimensions w/ dropper: 1.25 x 4 in (32 x 102 mm) (diameter x height)
- Dropper lid & bulb materials: See tables above for materials.
- Total weight: 2.58 oz (73.14 g)
- Notes on contents per bottle:
- each VK2 MK-4 2 mg/drop bottle contains:
- 1.756 mg of Vitamin K2 MK-4
21.24221.500 g of EVOOO
- each VK3 MK-4 10 mg/drop bottle contains:
- 8.729 mg of Vitamin K2 MK-4
- 14.620 g of EVOOO
- How did you come up with these ratios?
- There's an extra "buffer" in each bottle to make sure we aren't short changing you:
- 2.1% buffer in the ~2 mg/drop bottle
- 1.5% buffer in the ~10 mg/drop bottle
- Why the 2.1% in the ~2 mg/drop bottle? We wanted to keep the total grams of VK2 and the number of drops the same, so we kept those constant.
- There's an extra "buffer" in each bottle to make sure we aren't short changing you:
- By our calculations, there are ~860 drops of solution in each bottle.
- However, drop weights and drop counts vary depending on several factors. Please see the section in our FAQ regarding average drop weights that we currently use. Please also see our post regarding drop counts for more details.
- You may only be able to dispense ~845 drops using the dropper, with the remaining left as a film on the glass bottle and dropper (~15 drops). Use a mini scoop to scrape out the rest, or add a bit more EVOO and shake.
- each VK2 MK-4 2 mg/drop bottle contains:
Disclosures (updated Dec 20, 2024, updates underlined):
- We use glass containers for storage and packaging, although caps and seals are usually made from silicone, plastic, rubber, or LDPE.
- We use amber colored glass or wrap clear glass to block UV rays from reaching contents.
- We store bulk powder sealed in the freezer.
- We store EVOO at room temperature (74 - 78°F or 23.3 - 25.6°C) away from sunlight.
- We steam sterilize all glass bottles, containers, caps, liners, and utensils before using them for storage or bottling using distilled water.
- We prioritize the material of
packing utensilsall containers and utensils that come into contact with product in this order: glass, ceramic, stainless steel, plastic, aluminum. - Bulk powder we receive is usually stored in an aluminum or plastic container. We immediately weigh and move it to a glass container.
- More information about our process here.
- Please also review our Terms and Conditions before placing an order.
Are we missing something that you'd like to see? Let us know!
- Kaneki M, Hosoi T, Ouchi Y, Orimo H. Pleiotropic actions of vitamin K: protector of bone health and beyond? Nutrition. 2006 Jul-Aug;22(7-8):845-52. doi: 10.1016/j.nut.2006.05.003. PMID: 16815498. Link
- Traber MG. Vitamin E and K interactions--a 50-year-old problem. Nutr Rev. 2008 Nov;66(11):624-9. doi: 10.1111/j.1753-4887.2008.00123.x. PMID: 19019024. Link
- Nishiguchi T, Yamashita M, Maeda M, Matsuyama K, Kobayashi T, Kanayama N, Terao T. Improvement of vitamin K status of breastfeeding infants with maternal supplement of vitamin K2 (MK40). Semin Thromb Hemost. 2002 Dec;28(6):533-8. doi: 10.1055/s-2002-36697. PMID: 12536346. Link
24 Reviews Hide Reviews Show Reviews
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Vitamin K2 MK-4 in EVOOO
Fantastic product - really like that I can buy trusted and recommended K2 and D3 from the same supplier. I like that this is a small company who have a very dedicated focus on providing excellent product with efficient customer service and quick delivery (to the UK). Thank you!
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Great product
Very good quality supplement. The only MK4 variant I found in EVOO, which is preferable and does not irritate the gut. Good quality packaging with a well made bottle, + fast shipping to the UK and good customer service
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K2 MK-4
Love this product!! High quality and helps keep me on-track with my plan.
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Vitamin K2 MK4 - Excellent for sleep in almost every situation
I have tried this product for more than 20 days now. The positive thing is I haven't missed a day of sleep since I started taking it (which happened occasionally) and it has also helped a friend of mine to sleep and relax quite a bit, who is under heavy stress, despite not paying much attention to their diet. Despite being a minimalist when it comes to supplements, I really recommend this product.
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Vitamin K2 MK4 EVOOO
Tolerate it very well and the olive oil solvent is actually pretty delicious! Having good results already. Thank you Richard for such a great and transparent product as well as fantastic customer support!
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Great.
Love it! Both Vitamin D3 & K2. Recommend it to my family and friends. Always try to support small businesses that sell great products whenever I can! Will buy more in the future.
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Best on the market
By far the best Vitamin K I’ve ever used. Extreme quality control employed and it shows. I’d love to rate this product higher. From a wider jaw, to more prominent cheekbones, to a more desirable brow ridge this product will help you achieve facial harmony, full body harmony if used properly. This is small family company so I’ll leave what I mean up to interpretation. My go-to company henceforth.
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Vitamin K2
Excellent product. Nice bottle and good quality oil.
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Great product, great service, great company.
I'm really enjoying my K2, seems like a really good quality product and the transparency of lark was a breath of fresh air! Will definitely buy again from them when I'm out.