There are no reliable visual cues to distinguish between them
On the high end, one study from the 80s showed that 12g/day of taurine helped with acute viral hepatitis.[ref] (Including this to show the safety of a high dose not recommending it as a medical intervention.) Upper limit 1g/kg/day: As with anything, at really high doses, there could be negative effects from taurine
Mller C, Wingler K, Brigelius-Floh R (2003) 3UTRs of glutathione peroxidases differentially affect selenium-dependent mRNA stability and selenocysteine incorporation efficiency
Actually, the amount of studies that have been performed on lactoferrin is quite amazing, and its a molecule
Moderate consumption of alcohol may have a beneficial impact on the immune system
Some formulations may recommend refrigeration after opening to maintain stability, but always check the label for specific instructions