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Why Vitamin D Is Key

28 February 2022 by Kelly Darwin

Immune support supplements have gained a lot of extra attention over the past few years, and for good reason! One of the most helpful is an all-time Doublewood favorite, Vitamin D. Vitamin D3 is the best form of this essential nutrient, traditionally obtained through sun absorption on the skin. But for the western way of life, with outside time becoming increasingly harder to obtain, supplementation is the most convenient choice. Even then, environment, seasons, skin pigmentation and diet, can all strongly contribute to some degree of Vitamin D deficiency. Vitamin D plays a critical role in countless bodily functions such as immune system support, bone density maintenance, cardiovascular health and mood. The evidence backing the importance of achieving and maintaining healthy Vitamin D levels is insurmountable and continues to grow throughout the medical community.

Yet with the supplementation of this essential nutrient, comes a mild degree of caution. This is due to concerns that excessive D3 supplementation can lead to short term hypercalcemia, a condition that sometimes leads to forgetfulness, fatigue and nausea. Vitamin K2 to the rescue! Along with Vitamin D3, this important ingredient ameliorates the downsides to D3 supplementation. Vitamin K2 specifically acts in combination with D3 to prevent hypercalcemia and allow Vitamin D3 to do its job so you can gain the maximum results from this vital mineral. Our Vitamin D3 + K2 liquid drops provide the perfect balance of both supplements all in one bottle. Our unique blend contains the all-trans version of K2 (K2 Vital) which uses a MCT oil base, providing the extra fat needed for maximum absorption. This means you can take this powerful supplement on an empty stomach and get high absorption with little to no side effects. 


Another complimentary supplement to Vitamin D is the herb Rhodiola. This unique plant has a list of benefits that include supporting cognitive function, overall healthy mood, and energy levels, all without acting like a stimulant. These offerings make it an excellent pair with our Vitamin D3 + K2 complex for someone looking to naturally put a little pep in their step. Think of how that could change the course of your day!


Resveratrol is an ingredient containing numerous antioxidant properties. It is thought to support cardiovascular health, healthy aging and cognitive function. This polyphonic bioflavonoid compound is found in grapes and wine, and is even thought to be the main ingredient responsible for their well known anti inflammatory benefits. Resveratrol allows you to benefit from all the blessings of the fruit in one convenient capsule. Coupled with Vitamin D3 + K2, germs will be no match for your immune system. Cheers to good health!

Whether you’re a health enthusiast looking for an extra immune system boost. Or you’re new to supplements and looking to start a healthier lifestyle, Vitamin D3 + K2Rhodiola and Resveratrol are an excellent place to start!  

Ordering from Canada?

Unfortunately we can't accept credit card payments from non-US credit cards through, but we've been working hard to make our products available in Canada and have a few options for Canadians to order.

Many of our products are available to purchase on, and are currently warehoused in Canada. If the products you're looking for are on, this will be the easiest and quickest way to order.

Alpha GPC


Bacopa Monnieri Extract


CDP Choline


Citrus Bergamot Extract




Huperzine A




Magnesium Threonate


Rhodiola Rosea Extract


S-Acetyl L-Glutathione




Order by Email

Send us an email at with what you'd like to order, and we will send over an invoice from another of our websites that can take international credit card payments. Once the invoice is paid we will ship out your order promptly.