Months from manufacture to the date printed on the pack, by packaging form.
Some packs carry only a best-by date: White Labs PurePitch, and dry packets
from Fermentis. White Labs print a best-by six months after packaging (it
was four in the vial days); Fermentis quote 36 months from production for
dry yeast, and Lallemand the same. The viability curve runs from
manufacture, so a best-by is walked back by this many months.
Months from manufacture to the date printed on the pack, by packaging form.
Some packs carry only a best-by date: White Labs PurePitch, and dry packets from Fermentis. White Labs print a best-by six months after packaging (it was four in the vial days); Fermentis quote 36 months from production for dry yeast, and Lallemand the same. The viability curve runs from manufacture, so a best-by is walked back by this many months.