Optimum Advance Keto Prevention is better than a cure, so as pigmentation and hyperpigmentation are largely caused by over exposure to the sun, it's highly recommended that you wear a broad-spectrum SPF daily to keep your skin safe and stop any further damage occurring. If it's very hot and sunny, then wear a hat and don't expose your skin to the sun during the hottest part of the day.
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https://pillsfect.com/optimum-advance-keto/