Color & smell variations between different units purchased, is that ok?

Yes - it's expected!

HealFast is currently made in a "Just In Time" (JIT) manufacturing process. This means we carefully time the production to meet exact demand to ensure patients get the freshest product possible. 

In addition, we do not use artificial colors - so the product (and it's smell) come directly from the ingredients. Thus, when the ingredients are harvested (e.g., time of the year and their maturity) as well as the make up of the probiotics (14 living strains) - has a larger impact on the color and effervescence of the product from batch to batch. 

It is perfectly fine and safe. We do recommend storing in a cool, dry place away from sunlight. This ensures no ingredients diminish in effectiveness or augment in smells or tastes.