First up on the hot seat: hair vitamins. A lack of certain nutrients can in fact impact growth. Iron deficiency is a common cause of thinning hair, and getting enough biotin, folic acid, zinc and vitamin D is essential for healthy strands. But don't expect a basic multivitamin to create a miracle. 

Targeted options with higher doses like Nutrafol or Viviscal can help improve growth, but only if you have a deficiency. Don't get sucked into promises of extremely rapid growth through vitamins alone.

Nutrafol: Nutrafol is a hair growth supplement that has shown promise in a 2018 randomized controlled trial, particularly for women. It was found to improve hair growth by addressing factors like stress, micro-inflammation, and oxidative damage. Customer reviews on the brand's website suggest that Nutrafol can reduce shedding and stimulate new hair growth, improving thickness and volume. However, it's important to note that some customers did not observe any significant improvement​​.

What about oils? Castor and rosemary oil in particular have developed a reputation for boosting growth. The antioxidants and circulation-promoting effects may provide some benefit. But little research proves topical oils can speed up the actual growth cycle. Think of scalp-stimulating oils as more of a supplement to massage, which improves hair health overall. Focus the oils on your scalp for nourishing and circulation, not expecting them to create multiple inches quickly.

Mielle Hair Growth Oil Rosemary and Mint Oil: Rosemary oil has been recommended for encouraging hair growth and preventing hair loss. Its ability to block the effects of DHT, which can lead to hair loss, and its role in stimulating blood flow to hair follicles, are key factors contributing to its potential benefits for hair growth. However, more comprehensive research is needed to fully assess its efficacy. It's suggested to use rosemary oil in combination with scalp massages for improved hair health​​​​​​​​.

Finally, we come to serums. You'll see ingredients like caffeine or peptides touted in growth products. In reality, research on topical treatments shows limitations for actually increasing the length your hair can grow. Look for formulas focused on thickness, like Nioxin. And know that no serum truly replicates regular trims to minimize breakage and keep ends healthy.

Nioxin Serum: Nioxin products have been backed by over 30 years of independent research and are supported by the Institute of Trichologists. The range includes products for thinning hair, from shampoos to thickening styling products. Benefits include improved blood circulation to the scalp, reduced inflammation, a dandruff-free scalp, blocking of DHT, and promoting healthy shiny hair with its antibacterial and antifungal properties. Although there are mixed reviews, the general consensus is that Nioxin is effective for thinning hair.