I take VSL#3DS as well as two probiotics that technically do not need to be refrigerated: Culturelle and a specific strain of reuteri:
/www.google.com/search?q=Lactobacillus+Reuteri+%28NCIMB+30242%29&ie=utf-8&oe=utf-8www.lef.org/Vitamins-Supplements/item01821/FlorAssist-Heart-Health-ProbioticEven though they supposedly can remain in room temperature I keep them refrigerated anyway. You don't know how long they have remained on the store shelves without refrigeration so they probably lost some potency. I find that taking 3 capsules per day more effective than the recommended one capsule per day. Align is another probiotic that doesn't require refrigeration.
According to Consumerlab.com:
"# Align claimed to contain 1 billion live bacteria when manufactured “and an effective level until as least the “best by” date. ConsumerLab.com testing revealed that only 530 million bacteria were viable. However, a clinical study of the bacteria (Bifidobacterium infantis 35624) in Align showed that it could reduce symptoms of Irritable Bowel Syndrome (IBS) at a dose of just 100 million. ConsumerLab.com found that the product exceeded this amount, so the product’s claim to provide an effective dose is correct. Whether or not a higher dose might offer greater efficacy is not known.
"# Culturelle claimed to provide 10 billion cells in a daily capsule through the “best used by” date; ConsumerLab.com found only 5.8 billion viable cells. It is not clear whether this is a sufficient dose. Most clinical studies with Lactobacillus GG have used 10 to 20 billion viable cells per day. A dosing study (Saxelin 1991) using the bacteria in Culturelle (Lactobacillus GG) found that a daily dose of 1.5 billion cells was not able to colonize the gut, but a dose of 15 billion was. The amount found falls between these two dosages."