I took Miracle-Mineral-Supplement for several years in large doses several times per day without any immediate side-effects. Though I'd caution against the notion that this should serve as a benchmark or safety margin as I did what I had to do to stay alive at the time and was fully prepared to face the reality of the potential risks this could carry.
On the issue of side-effects, I found that Miracle-Mineral-Supplement impacted my digestive system as well as several of my minerals levels such as electrolytes. Though I could never be sure if this was a result of impaired digestion, or some other altercation brought on by the exposure and ingestion of Sodium Chlorite.
Nevertheless, I was able to maintain a balance by taking supplements and periodic salt baths(Himalayan salts). Though my magnesium levels seemed to be the hardest hit. Which apparently ties-in with the bodies capacity to fight off toxins.
Beyond this, I developed kidney problems shortly after I stopped taking Miracle-Mineral-Supplement . Though it remains that my particular condition is known to cause kidney and organ damage, and so I want to be careful not to offer this as anything more than a note for the record. - ie, in the event that someone else may experience or encounter similar symptoms along the way.
Hope this helps.
PS. I took on average, 15-19 drops(sometimes more), three times per day, for nearly 4 years. After which I switched from MMS to CDS and finally CDH. Only to discover that I was able to controlled the effects of my condition with Colloidal Silver and a Blood Purification device. Which worked out to be a far less aggressive treatment than that of the Sodium Chlorite products.