It's hard to say for sure. While many products advertised on Instagram may be legitimate, there are also scams and fake products.
Be cautious of products with heavily edited or manipulated images, suspiciously low prices, or promises that seem too good to be true.
Also, be wary of unfamiliar or unknown brands and sellers, and do your research before making a purchase. Look for reviews, check the seller's website or social media pages, and pay with a secure payment method.