If you’ve ever looked at the label on a hair supplement, you’ve probably seen one familiar word:
Biotin.
It shows up in gummies, capsules, shampoos, serums, and just about everywhere hair is part of the conversation. Somewhere along the way, biotin became so closely associated with hair that it almost feels natural to think:
“If it’s for hair, it has to have biotin.”
And there’s a reason biotin belongs in the conversation.
Biotin isn't the problem. The problem is treating it as the complete answer.
First, what does biotin actually do?
Biotin, also known as vitamin B7, is an essential nutrient. It plays a role in important processes that help the body metabolize fats, glucose, and amino acids. In other words, it’s involved in basic functions that help our cells use and process nutrients.
But hair biology doesn’t revolve around a single vitamin. The hair follicle is a biologically active structure with rapidly dividing cells, and different nutrients are involved in processes that support its normal function. Research on hair and nutrition also looks at nutrients such as iron, zinc, vitamin D, and B vitamins, among others. The evidence isn’t equally strong for all of them, but it helps illustrate why the conversation around hair nutrition is bigger than any one vitamin.
So the question doesn’t have to stop at:
“Does it have biotin?”
Does more biotin mean a better formula?
When you compare supplements, it’s easy to look at two labels and assume the one with more biotin must be better. But it’s also worth looking at how much of each ingredient is included, why it’s there, and how it fits into the rest of the formula.
In the end, the more useful question may be:
“Does this formula make sense as a whole?”
That applies to biotin, and to supplements in general. Sometimes, understanding what you’re buying starts with looking past what’s highlighted on the front of the bottle and paying more attention to the full label.
What does the science say about biotin for hair growth?
Biotin is everywhere in hair supplements. But there’s far less research on biotin used on its own for hair growth or hair quality. A scientific review published in 2024 looked specifically for that kind of evidence and found only three studies that met the researchers’ criteria.
In the strongest study among them, one group received biotin while another received a placebo, a substance without the active ingredient that allows researchers to compare results more reliably. The researchers found no difference in hair growth between the two groups. That doesn’t mean biotin has no role in nutrition.
The available evidence doesn’t show that more biotin means more hair.
How do you read a hair supplement label?
You don’t need to memorize vitamins or understand every line of a Supplement Facts panel to make a more informed choice. Start by looking beyond the ingredient that gets the most attention. Look at which ingredients are included, how much of each is included, and how the formula was built as a whole.
A big number can catch your eye. But on its own, it doesn’t tell you why that ingredient was chosen or what role it plays within the rest of the formula. The better you understand the label, the less you have to rely on whatever was printed in the biggest letters on the front of the bottle.
Can biotin interfere with lab tests?
One thing worth knowing: biotin can interfere with certain laboratory tests and cause inaccurate results. The FDA has specifically warned about biotin interference with some troponin tests, which are used when evaluating possible heart problems. The NIH also notes that some hormone tests, including thyroid tests, can be affected.
If you take a supplement containing biotin, tell your healthcare provider before having blood work done.
So why does Ruubyn® include biotin?
Because biotin is an essential nutrient with a legitimate role in nutrition. In the United States, the Daily Value (DV) for biotin is 30 mcg. The DV is a reference used on labels to help people understand and compare the amount of a nutrient in a serving. It is not a maximum limit.
Ruubyn® contains 300 mcg of biotin per serving, or 1,000% of the Daily Value. That percentage may look large on a label. But it’s also useful context: there are supplements on the market with 5,000 or even 10,000 mcg per serving, about 17 to 33 times the amount found in Ruubyn®.
But a bigger number on the label, on its own, doesn’t tell us that it will deliver a bigger benefit for hair.
The same caution applies to us. The available evidence doesn’t establish a hair-growth benefit for Ruubyn®’s 300 mcg dose either.
We include biotin because it’s an essential nutrient with a legitimate role in nutrition, not because 300 mcg has been shown to be a magic number for hair. Our goal was never to make the biotin dose the main selling point of the product. We chose to include it deliberately, without building the entire formula around it.
Biotin has its role. But hair is a bigger story.
Sources
National Institutes of Health, Office of Dietary Supplements. Biotin: Fact Sheet for Health Professionals. Yelich A, Jenkins H, Holt S, Miller R. Biotin for Hair Loss: Teasing Out the Evidence. Journal of Clinical and Aesthetic Dermatology. 2024;17(8):56–61. Almohanna HM, Ahmed AA, Tsatalis JP, Tosti A. The Role of Vitamins and Minerals in Hair Loss: A Review. Dermatology and Therapy. 2019;9:51–70.
U.S. Food and Drug Administration. Biotin Interference with Troponin Lab Tests. This article is for educational purposes only and is not medical advice.
