Hair Growth Ingredients: Peptides, Caffeine and More
Understand peptides, caffeine and other hair-care ingredients, including what was studied and how each ingredient fits a complete formula.
Start with the formula you use
An ingredient name becomes useful when you understand its role in the formula you will use. Explore peptides, caffeine and scalp-care ingredients, with explanations of the research and the product formats behind them.
The three peptides in Hair Growth Serum
| Ingredient | What the guide explains |
|---|---|
| Copper Peptides: Why One Letter Changes the Hair-Growth Story | GHK-Cu and AHK-Cu look almost identical on the page. Understanding the difference makes copper-peptide research—and your serum label—much easier to read. |
| Acetyl Tetrapeptide-3 and the Idea of Hair Anchoring | What does “anchoring” mean in a hair-care formula? Explore the tissue-support idea and a 24-week study without confusing a peptide with the complete mixture tested. |
| Biotin in a Capsule, Biotinoyl Tripeptide-1 in a Serum | Similar names can hide different ingredients. Decode the peptide on your scalp-serum label, the Procapil blend and why neither is interchangeable with a biotin supplement. |
Three questions to ask about any ingredient
- What is its role here? Look at the complete formula and how the product is used.
- What was tested? Check whether a source studied the ingredient alone, a mixture or the finished product.
- What was measured? Hair count, appearance, shedding and scalp comfort describe different outcomes.
Our guide to reading a hair study walks through these questions with an example. If you are choosing between products, begin with Hair Growth Serum vs Shampoo.
What is in NOURISH?
The labelled serving is four capsules daily with food. A 120-capsule bottle provides 30 days at that serving. The table describes the current label quantities and preparation names; it does not mean every listed ingredient has been clinically proven in this finished formula.
| Ingredient | Labelled amount per daily serving |
|---|---|
| Vitamin D | 25 mcg |
| Vitamin B6 | 2 mg |
| Biotin | 300 mcg |
| Zinc | 12 mg |
| Selenium | 70 mcg |
| Copper | 1 mg |
| Saw palmetto | 320 mg |
| Pumpkin seed extract | 300 mg |
| NAC | 300 mg |
| Ashwagandha | 250 mg |
| L-cystine | 250 mg |
| Tocotrienol complex | 50 mg |
Amounts and preparation forms matter when comparing studies: “pumpkin seed extract” is not automatically the same as pumpkin seed oil, and a tocotrienol complex is not the same as every vitamin E preparation. Compare the complete Supplement Facts with anything else you take and ask a clinician or pharmacist about suitability.
Quick answers
Do hair growth serums work?
Minoxidil serums are regulated drugs with trial evidence for pattern hair loss. Most other hair growth serums are cosmetics whose ingredients have early or laboratory evidence but few finished-product trials. Do hair growth serums work? →
Does castor oil or rice water help hair grow?
We did not find clinical trials showing that either makes hair grow. Both can change how hair feels; neither is a substitute for finding the cause of hair loss. Castor oil for hair growth →
Does pumpkin seed oil help hair loss?
One small 24-week trial in 76 men found a larger rise in hair count with 400 mg a day of pumpkin seed oil than with placebo. It is a promising signal that has not been confirmed in larger trials. Pumpkin seed oil evidence →
Does an ingredient study prove a product works?
No. A study of one ingredient at one dose does not show that a different finished formula, concentration or way of applying it will produce the same result. Ingredient vs product research →
