You have tightened your hair-care routine, switched shampoos, and still see more strands than usual in the drain. Before blaming the products, it is worth looking at your plate. Hair is one of the first places the body shows a nutritional shortfall, because non-essential tissues like hair get lower priority when key nutrients are scarce.
So which deficiencies are most often linked to hair fall? Here are the main ones.
Biotin (Vitamin B7)
Biotin supports the production of keratin, the structural protein that makes up hair. Low biotin is one of the more recognised nutritional links to thinning and brittle hair. While outright deficiency is uncommon, suboptimal intake can quietly affect hair quality, which is why biotin appears in most hair-support formulations.
Iron
Iron deficiency is one of the most common nutritional gaps worldwide, and among the most frequent contributors to hair fall, particularly in women. Iron helps carry oxygen to the hair follicle, and low stores can push more follicles into their resting, shedding phase. If hair fall comes with fatigue and paleness, iron status is worth checking with your doctor.
Zinc
Zinc plays a role in hair tissue growth and repair and in keeping the oil glands around follicles working properly. Low zinc has been associated with hair shedding, and it is a nutrient many diets fall short on.
Vitamin D
Vitamin D receptors are present in hair follicles, and low levels have been linked to hair thinning in research. Given how common low vitamin D is across India despite plentiful sunshine, it is a frequently overlooked piece of the puzzle.
Protein and other building blocks
Hair is made mostly of protein, so inadequate protein intake can slow growth and weaken strands. Amino acids such as methionine and cysteine, along with vitamin C which supports collagen and iron absorption, all contribute to the environment hair needs to grow well.
Closing the gaps
The most reliable approach is a varied diet with adequate protein, iron-rich foods, nuts, seeds and greens. When multiple small gaps overlap, a targeted supplement may help support the nutrients hair depends on. Purezen RootCause is built around this idea, combining D-Biotin, Hydrolyzed Collagen, L-Methionine, L-Cysteine, Zinc, Vitamin C and Bhringraj to support hair from within.
Nutrition is only one cause of hair fall. Stress, hormones, thyroid issues, genetics and post-illness shedding all play a part. If hair loss is sudden, patchy or severe, a dermatologist can help identify the specific driver.
The takeaway
Hair loss is most often linked to shortfalls in biotin, iron, zinc, vitamin D and protein. Addressing diet first, and using a hair-focused supplement to support those nutrients where needed, gives your follicles the raw materials they need, while keeping medical causes on your radar.