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The best way to boost glutathione levels to optimal levels is through injectable supplementation

On an empty stomach or between meals, take 4 ml (about 3/4 tsp) by mouth

Okra ameliorates hyperglycaemia in pre-diabetic and type 2 diabetic patients: A systematic review and meta-analysis of the clinical evidence

So even the topical route, which is the evidence-backed one, should be described as supported by small, sometimes industry-affiliated human cosmetic studies with modest effect sizes, not as proven. The correct posture toward topical GHK-Cu is cautious optimism grounded in real but imperfect human data which is still a materially stronger position than the injectable route can claim