Dennis (Calgary, Alberta, Canada) on 04/03/2012:
There's some research that Taurine might be one of the most important amino acids to regulate the heartbeat. The research paper on the link below discusses how someone who had 20,000 irregular heartbeats per day eliminated them with Taurine (along with L-Arginine). The paper says that the people involved in this particular study had tried many other supplements prior to Taurine, but Taurine (with L-Arginine) was the answer for them
See George Eby Research site.
They were using very, very heavy doses (10 - 20 grams per day). For a starter dose, one could take 3 grams per day of Taurine in 3 divided doses of 1 gram (the paper says to take with meals, but I have heard that it's better on an empty stomach so that it doesn't compete with other amino acids for absorption). According to what I have read, there are no side effects for dosages up to 3 grams. Beyond that, you might want to do some searching on the internet to check on this. Overall though, it seems that Taurine is pretty safe, but it's probably best to start with small doses and build up.
From the link, it seems that L-Arginine does have side effects (sometimes severe), so proceed with caution with L-Arginine, or just supplement with Taurine and see what happens.