Yes, a blood test is usually recommended to confirm a deficiency before starting treatment
It is popular for both health optimization and aesthetic benefits
Genet Res Int

Why Its Special Instant brightening tone up cream effect Helps reduce melasma, dark spots, and pigmentation Works as melanin control cream Improves uneven skin tone and dullness Lightweight, non greasy brightening cream Can be used as makeup base tone up cream Hydrates and smooths skin texture Suitable for all skin types including sensitive skin Daily use face brightening cream for men and women Supports radiant, glowing complexion Ingredients Key Beaute Melasma-X ingredients include: Aqua, Cyclomethicone, Glycerin, Methylpropanediol, Caprylic/Capric Glycerides, Cetyl Ethylhexanoate, Niacinamide, Broussonetia Kazinoki Root Extract, Morus Alba Root Extract, Centella Asiatica Extract, Sodium Hyaluronate, Dimethicone, Zinc Oxide, Titanium Dioxide, Cyclopentasiloxane, Dimethicone/Vinyl Dimethicone Crosspolymer How to Use Follow these steps for best results: Cleanse your face thoroughly Apply toner or serum if needed Take a small amount of Beaute Glutathione Cream Apply evenly on face and neck Gently blend until absorbed Use in the morning as tone-up cream Can be used at night for brightening care Tip: Always apply sunscreen during daytime use

Maybe thats going to bias me now because I agreed with a lot of it
Always check that your improvement is linked by taking it out again and seeing if you worsen again