K2 / MK-7 and Heart Palpitations A recent post on the Afibbers Forum suggests a possible connection between vitamin K2, especially the MK-7 form, and heart palpitations. I myself have wondered about this in my own case. I did a quick google and there seems to be numerous anecdotal reports of MK-7 and palpitations. Here's one example. Does anyone have any intelligence on this? Any clinical studies? If it is a problem for some people, I wonder what the mechanism might be. Thoughts appreciated. Thanks, Lance https://www.afibbers.org/forum/read.php?10,193333,193333#msg-193333 Tue, 26 May 2026 03:01:46 +0000 Phorum 5.2.23 https://www.afibbers.org/forum/read.php?10,193333,194071#msg-194071 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,194071#msg-194071 Joe GENERAL HEALTH FORUM Mon, 08 Jan 2024 01:17:09 +0000 https://www.afibbers.org/forum/read.php?10,193333,194056#msg-194056 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,194056#msg-194056 JohnG GENERAL HEALTH FORUM Sun, 07 Jan 2024 17:27:45 +0000 https://www.afibbers.org/forum/read.php?10,193333,194054#msg-194054 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,194054#msg-194054 bettylou4488 GENERAL HEALTH FORUM Sun, 07 Jan 2024 17:23:09 +0000 https://www.afibbers.org/forum/read.php?10,193333,194048#msg-194048 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,194048#msg-194048
Here's the Sperti site. [www.sperti.com]

You can buy them on Amazon as well. Here's a good video by Michael explaining the benefits of sunlight.
[www.youtube.com]]]> JohnG GENERAL HEALTH FORUM Sun, 07 Jan 2024 13:13:53 +0000 https://www.afibbers.org/forum/read.php?10,193333,194047#msg-194047 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,194047#msg-194047
As a test, I took almost no vitamin D supplements from August to Christmas and only tried to get the Sperti lamp exposure every day averaging about 3k a day according to Dr. Michael Hollick's D-Minder app (he's being the Sperti lamp too). My D level fell from 61 in August to 49 at Christmas. Not ideal, but not nearly as bad as the average drop for people over the winter. Going to test again in March, which is usually the D-level nadir.]]> JohnG GENERAL HEALTH FORUM Sun, 07 Jan 2024 13:09:46 +0000 https://www.afibbers.org/forum/read.php?10,193333,194041#msg-194041 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,194041#msg-194041
Quote
JohnG
Interesting question.



The other is Vitamin D. Every time I start taking D (whether it was 2000 IU or 10,000 IU), I feel like it increases my ectopy. D doesn't seem to be as sure a bet as fish oil, but I try to avoid it...going to the extreme of using Sperti Vitamin D lamps during the winter instead of taking it orally. I didn't start taking K2 with D until I had discovered this effect. Not sure if that is germane to this or not.

Good luck!

Also on that lamp I was just looking at this page talking about how effective it is. and there are warnings with a bunch of cardiac meds... I wonder what's up with that.

[optimizeyourbiology.com]]]> bettylou4488 GENERAL HEALTH FORUM Sun, 07 Jan 2024 01:04:55 +0000 https://www.afibbers.org/forum/read.php?10,193333,194040#msg-194040 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,194040#msg-194040
Quote
JohnG
Interesting question.

For years I have thought two supplements seem to trigger heart irritation in me.

The first, and by far the most conclusive for me, is fish oil. It's dose-dependent too with greater ectopy with higher doses. One time It tried 7g a day and that was a disaster. For me, even 1g a day seems to up the level of heart excitability. So, I eat fish. And I swear that even Salmon sometimes does this to me whereas I don't see it with whitefish.

The other is Vitamin D. Every time I start taking D (whether it was 2000 IU or 10,000 IU), I feel like it increases my ectopy. D doesn't seem to be as sure a bet as fish oil, but I try to avoid it...going to the extreme of using Sperti Vitamin D lamps during the winter instead of taking it orally. I didn't start taking K2 with D until I had discovered this effect. Not sure if that is germane to this or not.

Good luck!

I noticed the D correlation as well. What are these lamps? I asked my functional cardiologist about a lamp for D and he didn't know of any and he has all the things ..LOL.]]> bettylou4488 GENERAL HEALTH FORUM Sun, 07 Jan 2024 00:52:27 +0000 https://www.afibbers.org/forum/read.php?10,193333,193613#msg-193613 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,193613#msg-193613
For years I have thought two supplements seem to trigger heart irritation in me.

The first, and by far the most conclusive for me, is fish oil. It's dose-dependent too with greater ectopy with higher doses. One time It tried 7g a day and that was a disaster. For me, even 1g a day seems to up the level of heart excitability. So, I eat fish. And I swear that even Salmon sometimes does this to me whereas I don't see it with whitefish.

The other is Vitamin D. Every time I start taking D (whether it was 2000 IU or 10,000 IU), I feel like it increases my ectopy. D doesn't seem to be as sure a bet as fish oil, but I try to avoid it...going to the extreme of using Sperti Vitamin D lamps during the winter instead of taking it orally. I didn't start taking K2 with D until I had discovered this effect. Not sure if that is germane to this or not.

Good luck!]]> JohnG GENERAL HEALTH FORUM Fri, 15 Dec 2023 00:55:20 +0000 https://www.afibbers.org/forum/read.php?10,193333,193386#msg-193386 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,193386#msg-193386
I myself have not found that MK-7 causes palpitations. But I find it interesting that some people do, and I wondered what the mechanism might be.

Lance]]> ln108 GENERAL HEALTH FORUM Wed, 22 Nov 2023 05:00:50 +0000 https://www.afibbers.org/forum/read.php?10,193333,193353#msg-193353 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,193353#msg-193353 months when sunshine exposure isn't possible (here in NE Ohio). I have not found that causes palpitations for me.
Jarrow Formulas, MK-7, 90 mcg, 120 Softgels
[www.iherb.com]

Many years ago, I had severe muscle pain and weakness... diagnosed as fibromyalgia and I was treated by
various physicians but had no success in eliminating the symptoms. When I became a patient of a
Functional Medicine MD and because the fibromyalgia history, etc... she tested my vitamin D levels.
... results were in the teens when optimal should be between 50 and 80 ng/ml (according to
Genova Diagnostics .. [genovadiagnostics.com])
I aim for results of about 60 ng/ml since that’s where my muscles feel the best.

It is very important that you be tested to determine your vitamin D levels...( 25 OHD) and if you supplement with D, then be sure you are staying in the recommended range.

A noteworthy clip from a Klaire Labs product data sheet …on their Vitamin D plus K product indicates:

… "Cardiovascular function: Emerging studies show that vitamin D deficiency is a highly-prevalent condition,4 and is independently associated with most cardiovascular disease (CVD) risk factors.8 Experimental studies have established a role for vitamin D metabolites in pathways that are integral to healthy cardiovascular function, including inflammation, thrombosis, and the renin–angiotensin system (RAS).9 Additionally, both vitamin D3 and vitamin K2 support the normal activity of matrix Gla protein (MGP), which maintains healthy calcium balance in vascular tissues.10 Clinical research suggests that the combination of vitamin D3 plus K2 together provides support for
healthy cardiovascular function." 2,3,11

2.Altern Med Rev. 2010;15(3):199-222
3.Crit Rev Food Sci Nutr. 2017 12;57(18):3959-3970
4. J Clin Nutr. 2004 ;79(3):362-71
8. Am J Med Sci. 2009;338(1):40-4
9 Chem Biol. 2014;21(3):319-329
10. Arterioscler Thromb Vasc Biol. 2005 Aug;25(8):1629-33
11 J Nutr. 2004; 134(11):3100-5

Additionally, The Townsend Letter for Doctors and Patients has published an abundance of reports on the ‘vitamin D’ topic … worth scrolling through some listed here. [duckduckgo.com]

If you’d like to read the Product Data sheets from DFH and Klaire Labs, send me a PM and I’ll share with you.

Best to you,
Jackie]]> Jackie GENERAL HEALTH FORUM Thu, 16 Nov 2023 23:11:45 +0000 https://www.afibbers.org/forum/read.php?10,193333,193337#msg-193337 Re: K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,193337#msg-193337 Joe GENERAL HEALTH FORUM Tue, 14 Nov 2023 23:25:30 +0000 https://www.afibbers.org/forum/read.php?10,193333,193333#msg-193333 K2 / MK-7 and Heart Palpitations https://www.afibbers.org/forum/read.php?10,193333,193333#msg-193333 recent post on the Afibbers Forum suggests a possible connection between vitamin K2, especially the MK-7 form, and heart palpitations. I myself have wondered about this in my own case. I did a quick google and there seems to be numerous anecdotal reports of MK-7 and palpitations. Here's one example.

Does anyone have any intelligence on this? Any clinical studies? If it is a problem for some people, I wonder what the mechanism might be.

Thoughts appreciated. Thanks, Lance]]> ln108 GENERAL HEALTH FORUM Tue, 14 Nov 2023 19:16:39 +0000