CleanAmp™ dNTPs are most stable in the shipped mix, diluted in PCR buffer (8-9 pH). In these conditions, they are stable for at least one year at –20°C. Exposure to higher temperatures during shipment does not pose performance risks. Avoid repeated freeze/thaw cycles and exposure to room temperature for more that 24 total hours. Upon first use, it is recommended to aliquot samples into single use portions.