Sierra Starr Reign Drops Biotin Hair and Scalp Oil in an amber 1 fl oz dropper bottle, on a white background.

Reign Drops Biotin Hair & Scalp Serum

$32.00
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Sierra Starr Reign Drops Biotin Hair and Scalp Oil in an amber 1 fl oz dropper bottle, on a white background.

Reign Drops Biotin Hair & Scalp Serum

$32.00

Daily scalp care with a fresh yuzu citrus scent. Reign Drops brings together biotin, amino acids and pea sprout extract to moisturize the scalp and support shinier, fuller-looking hair.

Size: 1 fl oz / 30 mL

Black Friday preorder. Ships by December 14, 2026.

U.S. shipping: $8 Standard · $11 Economy · $15 Expedited. Free on orders $100+.

International: calculated at checkout; $5 handling on paid USPS shipments. Delivery details.

Formula highlights
  • Biotin and amino acids: help condition hair for a stronger, fuller-looking appearance.
  • Pea sprout extract: supports a healthy-looking scalp and hair.
  • Vitamin E: helps condition hair and support shine.

For hair and scalp care on wet or dry hair.

How to use

Apply to wet or dry hair and scalp, then massage gently with your fingertips.

Full ingredient list

Water (Aqua), Propanediol, Glycerin, Salvia Officinalis (Sage) Leaf Extract, Linum Usitatissimum (Linseed) Seed Extract, Biotin (Vitamin B7), Panthenol, Arginine, Lactic Acid, Glycine Soja (Soybean) Germ Extract, Triticum Vulgare (Wheat) Germ Extract, Scutellaria Baicalensis Root Extract, Wheat Amino Acids, Soy Amino Acids, Arginine HCl, Serine, Threonine, Pisum Sativum (Pea) Sprout Extract, Sodium Benzoate, Squalane, Tocopheryl Acetate, Ubiquinone, Phenoxyethanol, Ethylhexylglycerin, Polysorbate 80, Melia Azadirachta Leaf Extract, Melia Azadirachta Flower Extract, Corallina Officinalis Extract, Curcuma Longa (Turmeric) Root Extract, Ocimum Basilicum (Basil) Flower/Leaf Extract, Ocimum Sanctum Leaf Extract, Xanthan Gum, Potassium Sorbate, Citrus Junos (Yuzu) Oil, Phytic Acid.

Fragrance information

Fresh yuzu citrus scent from Citrus Junos (Yuzu) Oil. This is a scented formula.

Good to know

A water-based biotin serum with glycerin and squalane. Contains wheat- and soy-derived ingredients. Review the full ingredient list before use.

For external use only. Avoid contact with eyes and mouth. If irritation occurs, discontinue use. Keep out of reach of children.

Shipping & delivery

Shipping rates are in USD. Delivery times are estimates after shipment.

U.S. service Rate After shipment
Standard $8 7–14 business days
Economy $11 5–8 business days
Expedited (Express) $15 1–3 business days

Free shipping at $100+: Eligible orders of $100 or more receive free U.S. Standard, Economy or Express shipping. Eligible international USPS orders also qualify for a free shipping option at checkout. Other international carrier options remain calculated at checkout.

International shipping: Rates are calculated at checkout for your destination and selected service.

Handling fee: A $5 fee is added to paid international USPS shipping. It is not added to domestic orders or eligible free-shipping options. Other international carrier rates are shown at checkout.

Black Friday preorders ship by December 14, 2026. Delivery estimates begin after shipment. Expedited shipping changes transit time, not the preorder dispatch date. Tracking is emailed when your order ships.

Preorder FAQ · Shipping policy · Preorder cancellation policy

Save when you bundle. Reign Drops are also in the Moisture & Seal Duo, the His & Hers Oil Duo, and the Complete Collection.

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