[31] These manufacturer specific guidelines have no clear scientific basis

WATER, TRIETHYLHEXANOIN, HYDROGENATED POLY(C6-14 OLEFIN), BUTYLENE GLYCOL, 1,2-HEXANEDIOL, METHYLPROPANEDIOL, NIACINAMIDE, PHENYL TRIMETHICONE, DIETHOXYETHYL SUCCINATE, POLYGLYCERYL-10 MYRISTATE, FRAGRANCE, HIPPOPHAE RHAMNOIDES OIL, ETHYLHEXYLGLYCERIN, ALLANTOIN, HYDROGENATED LECITHIN, HIBISCUS ESCULENTUS FRUIT EXTRACT, CORCHORUS OLITORIUS LEAF EXTRACT, CARUM PETROSELINUM (PARSLEY) EXTRACT, GLUTATHIONE, SODIUM GLUCONATE, ADENOSINE, CELLULOSE GUM, HEXYL CINNAMAL, GLUCONOLACTONE, MELIA AZADIRACHTA LEAF EXTRACT, LINALOOL, MELIA AZADIRACHTA FLOWER EXTRACT, LAVANDULA ANGUSTIFOLIA (LAVENDER) FLOWER WATER, HYACINTHUS ORIENTALIS (HYACINTH) EXTRACT, CENTAUREA CYANUS FLOWER EXTRACT, CHAMOMILLA RECUTITA (MATRICARIA) FLOWER/LEAF EXTRACT, CURCUMA LONGA (TURMERIC) ROOT EXTRACT, BORAGO OFFICINALIS EXTRACT, SALVIA SCLAREA (CLARY) EXTRACT, LIMONENE, ALPHA-ARBUTIN, OCIMUM SANCTUM LEAF EXTRACT, CORALLINA OFFICINALIS EXTRACT, THIOCTIC ACID, BIOTIN, BIOTINOYL TRIPEPTIDE-1, ACETYL HEXAPEPTIDE-8, TRIPEPTIDE-1, TRIPEPTIDE-3, MYRISTOYL PENTAPEPTIDE-17, HEXAPEPTIDE-9

Drucker 2022
If youre past the 56-day in-use window and the pen looks fine, the safe answer is still to discard