If you have any chronic medical conditions (such as heart disease or epilepsy, for example), or are on long-term medications, consult your healthcare provider to determine if Lipo-B is safe for you before starting
I trust the Pure Encapsulations brand for quality and ingredients
Basically a study looked at 100 drugs & found that 90% of them were fully potent 15 years after their expiration date, though that may vary by drug, and perhaps liquid forms are a bit more vulnerable (perhaps)
Too much can potentially cause irritation or even counterproductive responses
such as dizziness, sickness or diarrhoea, then it is more than likely that B12 is unsuitable for your client, although this is extremely rare
A recent study found both NAD and B12 to be effective in increasing telomere length, thereby slowing the aging process