GLP- 1 receptor agonists have a mechanism of action that provides a multimodal strategy for the treatment of obesity and T2DM
GHK-Cu works progressively: weeks 24 show improved hydration and reduced redness

Certain groups should exercise particular caution: Individuals with hypothyroidism , as L-carnitine may interfere with thyroid hormone action at the tissue level Those with seizure disorders , as the levocarnitine SmPC notes a possible association with increased seizure frequency, particularly in those with a prior history People with kidney disease , for whom unsupervised supplementation is not advised Pregnant or breastfeeding women , for whom safety data remains limited When to seek help: Call 999 immediately if you experience severe chest pain, sudden shortness of breath, or symptoms that could indicate a heart attack or stroke Contact NHS 111 for urgent concerns that are not immediately life-threatening Contact your GP promptly if you experience palpitations, significant gastrointestinal symptoms, new or worsening seizures, or any unexpected changes in health after starting supplementation If you suspect you have experienced a side effect from a supplement or medicine, you can report it to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk

So, when picking between them, it really comes down to your preferences and what your doc recommends
Till date, systemic skin whitening agents do not have much scientific evidence regarding their use and strict laws should be enforced to ban the use of these agents until well conducted randomized controlled trials are available ensuring the safety and efficacy of these agents