What can I add to it so it will last up to 3 years? I want to sell it in my shop.
Md Ariful Islam
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,
এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
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,
পিজিটি(মেডিসিন)
Sodium benzoate and honey. This will make it last longer, maybe 6-8 months. If you want it to last 3 years, you need an industrial grade preservatives, which is not healthy for your skin.
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