I have some z1, z2 and z5 from 2001. The website says that less than 3 years old is for "optimum" results. Should I bother trying it to see if its still good or just get new stuff.

 

Email Sal.

 

When stored at average room temperature between 65° and 75° degrees, shelf life is as follows:

Z-PC 3+ years
Z-1 For optimum results, use before 3 years.
Z-2 For optimum results, use before 3 years.
Z-3 For optimum results, use before 3 years.
Z-5 For optimum results, use before 3 years.
Z-6 5+ years
Z-7 5+ years
Z-8 5+ years
Z-9 5+ years
Z-10 For optimum results, use before 2 years.
Z-12 For optimum results, use before 2 years.
Z-14 For optimum results, use before 2 years.
Z-16 3 to 5 years
Z-18 5 years +
ZFX For optimum results, keep tightly capped, avoiding moisture. Use before 18 months.

 

Shake up the bottles and then open them up, it everything mixes together, there are no "chunks" floating you will be fine, it should be alright as long as it did not freeze.