The best multivitamin depends entirely on your specific health needs, diet, and lifestyle. As a 35-year-old female, look for high-quality, third-party tested brands (such as USP, NSF, or ConsumerLab certified), such as Nature Made, One A Day, or Ritual. Ideally, your multivitamin should contain key nutrients like Vitamin D3, B12, Calcium, and Iron (unless contraindicated). However, supplements cannot replace a balanced diet. I highly recommend getting a simple blood panel done so we can target any actual deficiencies you might have, rather than guessing. Always consult your doctor before starting any new supplement.