We ship all products thermally protected, with DPD Next Day to keep them potent and effective. You must promptly refrigerate upon delivery.

• Orders placed after 10am are dispatched the next working day.
• Delivery arrives the day after dispatch.
• You’ll receive tracking details once your order is on its way.
• Shipping Monday - Thursday. Orders placed after 10am Thursday will be shipped the following Monday.
• Please ensure your availability to take delivery any delays caused by failed delivery attempts are not the fault of Holte Health.

Returns

All Sales Are Final. Due to the specific nature of our products, we are unable to accept returns or exchanges once an order has been processed and payment received.

Why do we have this policy?

• Temperature Integrity: Our NAD+ vials require specific cold storage temperatures to maintain potency. Once a product leaves our facility, we cannot verify that it has been kept within the necessary temperature range. A returned product cannot be safely resold or reused without risking compromised quality.
• Strict Quality Control: We adhere to rigorous safety protocols during manufacturing and initial shipping. Accepting returns introduces a "chain of custody" break where we cannot guarantee the safety or sterility of the vials. For your safety and the safety of all our customers, we do not restock returned items.

We offer next-day delivery DPD delivery only to ensure the product arrives promptly.

Shipping Monday - Thursday. Orders placed after 10am Thursday will be shipped the following Monday.

Please ensure your availability to take delivery any delays caused by failed delivery attempts are not the fault of Holte Health.

We only ship to the U.K currently.

Yes, free shipping is available for orders over £100. This applies to U.K only.

• Orders placed after 10am are dispatched the next working day.
• Delivery arrives the day after dispatch.
• You’ll receive tracking details once your order is on its way.
• Shipping Monday - Thursday. Orders placed after 10am Thursday will be shipped the following Monday.
• Please ensure your availability to take delivery any delays caused by failed delivery attempts are not the fault of Holte Health.

Yes, once your order is shipped, we’ll send you a tracking number so you can monitor its progress.

If you realise you’ve entered the wrong address, please contact us immediately at 02080586517. We’ll do our best to update it before the order is dispatched.

Orders can only be modified or cancelled before they are shipped. Please contact us as soon as possible if you need to make changes on 44 (0)20 80586517

If your order is damaged during shipping, please reach out to us within 3 days with photos of the damage and your order number. We’ll try to resolve the issue promptly.

If your order hasn’t arrived within the estimated timeframe, please check the tracking information first. If you still have concerns, send us a message.

NAD+ (Nicotinamide Adenine Dinucleotide) is a naturally occurring molecule found in every cell of the body. It plays a crucial role in cellular energy production, DNA repair, and overall cellular health.

Our wellness pen delivers a precise micro-dose under the skin, designed for smooth absorption and consistent results. It’s quick, discreet, and easy to use.

How-to-use guide can be found here.

The pen is made for adults who want more energy, focus, and healthy ageing support. Whether you’re a busy professional, someone focused on beauty and skin health, or looking to recover faster from exercise, it’s a natural supplement addition to your wellness routine.

Many people begin with daily use, then naturally adjust to three or four times per week. Others choose to add extra sessions when they want an additional boost, for example after exercise or during particularly busy periods.

The NAD+ Pen offers a practical middle ground. It is portable, easy to use at home, and more affordable than regular IV therapy. It also delivers NAD+ directly, rather than relying on the digestive system like oral supplements.

For those who prefer a needle-free option, we also offer NAD+ Strips, designed for fast absorption through the mouth.

No, the NAD+ Pen is not intended to diagnose, treat, cure, or prevent any disease or condition. Its purpose is to support and encourage a healthy lifestyle.

Side effects are uncommon, but individual responses may vary. If you experience any unusual reactions, discontinue use and consult a healthcare professional.

No. The pen is most effective when combined with balanced nutrition, exercise, and good sleep habits. Think of it as a supplement enhancer, not a replacement.

We ship all NAD+ products in insulated protected packaging with DPD Next Day to help maintain potency.

Please refrigerate your NAD+ as soon as it arrives. Short periods out of cold storage do not affect the product, so place it in the fridge when you receive it.

Yes. Glutathione and NAD+ can complement each other as part of a wider wellness routine. NAD+ plays a role in cellular energy production and repair, while Glutathione helps protect cells from oxidative stress and supports the body’s natural detoxification processes.

Many customers choose to use both products. We recommend using separate injection sites and speaking with a healthcare professional before combining them, especially if you have a medical condition, take medication, or have any concerns.

Glutathione is a tripeptide molecule (made of three amino acids: cysteine, glycine, and glutamic acid) found in every cell of your body. It’s widely regarded as the body’s master antioxidant essential for detoxification, immune function, and protecting cells from oxidative damage. Your body produces it naturally, but levels decline significantly with age, stress, poor diet, and environmental toxins. Supplementing with the Holte Pen® helps restore those levels directly.

Oral Glutathione is largely broken down by digestive enzymes in the gut before it can reach your cells studies suggest oral bioavailability can be as low as 3–5%. The Holte Pen® delivers Glutathione subcutaneously, bypassing the digestive system entirely and achieving close to 100% bioavailability. This means more of the active compound actually reaches your cells where it’s needed.

The Holte Pen® uses ultra-fine 4mm micro-needles designed for subcutaneous (just under the skin) injection. Most users describe the sensation as a brief, mild pinch — far less uncomfortable than a standard blood test or vaccine. Injecting into a fatty area like the abdomen and rotating your injection site each time helps minimise any discomfort.

Individual experiences vary, but many users report noticing improvements in skin clarity and energy levels within the first 1–2 weeks. Deeper benefits such as improved immune resilience and detoxification support tend to build over 1–3 months of consistent use. Glutathione works cumulatively, so regular use delivers the best results.

Yes. Glutathione and NAD+ complement each other well. NAD+ supports cellular energy production and repair, while Glutathione protects cells from oxidative damage and aids detoxification. Many of our customers use both as part of their daily wellness routine. We recommend injecting at separate sites and consulting your healthcare professional if you have any concerns.

Keep your Glutathione cartridges refrigerated between 2–8°C at all times. Short periods at room temperature during use are fine just return the pen to the fridge promptly after your injection. Do not freeze. We ship all orders with thermal protection and cold packs to maintain the cold chain during transit.