Amazon.com : Knox Unflavored Gelatin (0.25 Oz Envelopes ...- น้ำยาล้างมือ amazon usa ,Reviewed in the United States on September 27, 2017. Verified Purchase. Using this Knox Gelatin (unflavored) to build stronger nails as health item. Mix a packet in water to dissolve and drink it once in morning and once before bed. Instrumental guitar/ukulele friends advised they have used Knox for years to strengthen their nails and proof is ...

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