Liquid Drops Manufacturer for Supplement Brands

Our liquid lines run two filling formats: gravity and piston fillers for low-viscosity tinctures, and heated jacketed fillers for oils and suspensions that thicken below 20°C. Typical line speed is 2,000-4,000 bottles per hour, depending on fill volume and viscosity. Each bottle passes an inline checkweigher; out-of-tolerance units are rejected before capping.

Dropper assemblies are a common failure point, so we qualify each component batch before production. Pipettes are tested for drop volume consistency, glass thickness and bulb fit. Tamper-evident bands, child-resistant closures and induction seals are available. Secondary packaging options include single cartons, display boxes and shrink-wrapped trays.

Not every ingredient works as a liquid drop. Fat-soluble actives such as vitamin D3, vitamin K2, CoQ10 and omega-3 need an oil carrier, typically MCT or sunflower oil. Water-soluble actives need glycerin, propylene glycol or an aqueous base with a preservative system. Alcohol tinctures extract botanicals well but carry taste and labelling implications in the EU and Middle East.

Dose per drop depends on pipette calibration. A standard 30 ml dropper delivers roughly 0.05 ml per drop, so 1,000 IU of vitamin D3 needs about 0.025 mg of active per drop. We test drop weight across 20 bottles per batch and supply the average drop volume for your label. Flavour masking with natural essences, stevia or monk fruit is available where the brief allows.

Every batch is tested for assay, pH, viscosity, microbial limits and heavy metals before release. We retain samples for 24 months and issue a Certificate of Analysis with each shipment. Stability testing runs at 25°C/60% RH and 40°C/75% RH, with 3-month accelerated data available before you commit to a full run.

For US and EU buyers we prepare the documentation set: GMP certificate, ISO 22000 certificate, HACCP plan summary, free-sale certificate and ingredient specifications. Halal certification can be arranged where the formula qualifies. Air freight from Guangdong reaches Los Angeles in 3-5 days and Rotterdam in 5-7 days; sea freight takes 18-30 days depending on port.

Every liquid drops batch is tested against a written specification before release. Incoming raw materials are sampled at 100% of containers for identity by FTIR or HPLC, and each lot is quarantined until potency, microbials and heavy metals clear. For finished drops, we test identity and potency of every active at 100% of batches, microbial limits (TPC, yeast and mould, E. coli, Salmonella) at 100%, heavy metals (lead, cadmium, arsenic, mercury) at 100%, and pH and density at 100%. Disintegration testing does not apply to liquids; instead we run viscosity and sedimentation checks for suspensions and clarity for aqueous systems.

A Certificate of Analysis (COA) accompanies every batch and states the product name, lot number, manufacture and expiry dates, specification limits, test methods and results, and the signature of the QC manager. We retain samples from every batch for 24 months after the expiry date in a temperature-controlled archive. Stability follows a real-time protocol at 25°C/60% RH and 30°C/65% RH, with accelerated conditions at 40°C/75% RH for three months. Assays are taken at 0, 3, 6, 12, 18 and 24 months, covering potency, pH, microbials and packaging compatibility.

For export, the batch record package includes the executed batch manufacturing record, line clearance records, fill weight checks every 30 minutes, and deviation reports if any. We do not release a batch without a completed review by a second qualified person. If a buyer requires third-party verification, we can send samples to an accredited external laboratory at cost, and the resulting report is added to the batch file. This level of documentation is standard for liquid drops manufacturing and supports audits by retailers and notified bodies.

Liquid drops are filled into 15 ml, 30 ml, 50 ml and 60 ml amber or clear glass dropper bottles with tamper-evident caps and calibrated glass or plastic pipettes. For larger volumes we offer 100 ml bottles and 1 litre bulk containers. We also supply stick packs and sachets for single-serve liquid drops, with fill volumes from 1 ml to 10 ml. Bottle and carton artwork must include the FDA dietary-supplement label elements: statement of identity, net quantity, supplement facts panel, other ingredients, directions for use, and the manufacturer or distributor name and address. We check artwork against these requirements before printing.

Lot and expiry coding is applied by inkjet or laser on the bottle base and the carton. The format follows the buyer's instruction, typically LOT YYMMDD and EXP YYMM. Cartons are specified with a minimum 300 gsm board, and shippers are 5-ply corrugated with a compression strength of at least 8 kN/m. Pallets are 1,200 x 1,000 mm or 1,200 x 800 mm, stretch-wrapped and labelled with SSCC if required. For Amazon FNSKU and retail compliance, we can apply FNSKU labels, polybag the bottles where required, and print carton markings to the buyer's specification.

Retail readiness extends to the packaging compatibility report, which confirms that the dropper, gasket and bottle do not interact with the formulation. We run this test for every new bottle and closure combination before mass production. If a buyer supplies their own components, we require a pre-production sample run of at least 100 units to check filling performance and seal integrity. All packaging materials are checked against the EU and US food-contact requirements, and declarations of compliance are available on request.

The minimum order quantity for liquid drops is 1,000 units per SKU, with 1,000 units for pilot runs. Samples take 7 to 10 working days from approved formulation and artwork. Mass production runs 20 to 35 working days after sample approval, depending on bottle and carton lead times. We provide a production schedule at order confirmation and update it weekly. For repeat orders, the lead time is typically 20 to 25 working days because components are held in stock.

We ship under EXW, FOB and DDP terms. FOB ports are Shenzhen and Hong Kong; DDP is available for the US, EU, UK and Australia, with duties and taxes handled by our freight partner. Air freight takes 5 to 8 days door to door, and sea freight takes 25 to 35 days depending on the destination port. For urgent launches, we can split a batch between air and sea. Cartons are sized to maximise container fill, and we provide a loading plan with container utilisation.

The document pack for each shipment includes the commercial invoice, packing list, bill of lading or airway bill, Certificate of Analysis, Material Safety Data Sheet (MSDS) for the finished liquid, and a free-sale certificate where required by the destination country. For plant-based ingredients, a phytosanitary certificate can be arranged if the importing country asks for it. We also provide a certificate of origin on request. All documents are issued in English, and we can add the buyer's letterhead for the COA if needed.